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Probability and StatisticsQuestion and Answers: Page 4

Question Number 186547 Answers: 1 Comments: 0

p(a or b)=0.7 and p(a)=0.4 find p(b) if a and b are independent

$p (a o r b) = 0.7 a n d p (a) = 0.4$ $f i n d p (b) i f a a n d b a r e i n d e p e n d e n t$

Question Number 186331 Answers: 0 Comments: 5

How many possibilities are there for picking random numbers that ranges from 1-3 that sum up to 7?

Question Number 185378 Answers: 0 Comments: 0

Question Number 183285 Answers: 0 Comments: 0

Question Number 182952 Answers: 1 Comments: 0

what is the probability that at least two from 23 people have birthday at the same day? (an unsolved old question)

$w h a t i s t h e p r o b a b i l i t y t h a t a t l e a s t$ $t w o f r o m 23 p e o p l e h a v e b i r t h d a y a t$ $t h e s a m e d a y ?$ $(a n u n s o l v e d o l d q u e s t i o n)$

Question Number 182620 Answers: 1 Comments: 0

Question Number 182429 Answers: 0 Comments: 1

Question Number 182360 Answers: 1 Comments: 5

In equation ax^2 +bx+c=0, a,b,c are randomly selected from integers; what is the probability that roots will be real?

$In equation {ax}^{2} + bx + c = 0, a, b, c are$ $randomly selected from integers;$ $what is the probability that roots$ $will be real ?$

Question Number 182331 Answers: 1 Comments: 0

a box contains 5 white balls and some black balls. if the probability of drawing a black ball from the bag is twice the prbability of drawimg a white ball then find number of black balls.

$a b o x c o n t a i n s 5 w h i t e b a l l s a n d s o m e b l a c k$ $b a l l s . i f t h e p r o b a b i l i t y o f d r a w i n g a b l a c k$ $b a l l f r o m t h e b a g i s t w i c e t h e p r b a b i l i t y$ $o f d r a w i m g a w h i t e b a l l t h e n f i n d n u m b e r$ $o f b l a c k b a l l s .$

Question Number 181677 Answers: 0 Comments: 0

the distirbution function for a random variable X is F(x)= { ((1−2e^(−2x) x≥0)),((0 x<0)) :} find 1)the density function f(x) 2)p(x>2) 3)p(−3<x≤4)

$t h e d i s t i r b u t i o n f u n c t i o n f o r a r a n d o m$ $v a r i a b l e X i s$ $F (x) = {\begin{cases} 1 - 2 e^{- 2 x} x ⩾ 0 \\ 0 x < 0 \end{cases}$ $f i n d$ $1) t h e d e n s i t y f u n c t i o n f (x)$ $2) p (x > 2)$ $3) p (- 3 < x ⩽ 4)$

Question Number 181140 Answers: 0 Comments: 6

I watch a favorite TV program daily for 30 min. If there were ads every 3 hours, what′s the probability that i will see ads once again the next day while watching that program?

$I w a t c h a f a v o r i t e T V p r o g r a m d a i l y f o r 30 m i n .$ $I f t h e r e w e r e a d s e v e r y 3 h o u r s, {w h a t}^{'} s t h e$ $p r o b a b i l i t y t h a t i w i l l s e e a d s o n c e a g a i n t h e n e x t$ $d a y w h i l e w a t c h i n g t h a t p r o g r a m ?$

Question Number 180990 Answers: 1 Comments: 0

2 blondes hair of 6 girls will sit around a circular table, what′s the probability that those two girls sitting next to each other?

$2 b l o n d e s h a i r o f 6 g i r l s w i l l s i t a r o u n d a c i r c u l a r$ $t a b l e, {w h a t}^{'} s t h e p r o b a b i l i t y t h a t t h o s e t w o g i r l s$ $s i t t i n g n e x t t o e a c h o t h e r ?$

Question Number 180821 Answers: 0 Comments: 0

We want to randomly fill six digits with one of −1 or +1, what′s the probability that the sum value of those digits is zero provided that the same values of digits aren′t adjacents?

$W e w a n t t o r a n d o m l y f i l l s i x d i g i t s w i t h o n e o f$ $- 1 o r + 1, {w h a t}^{'} s t h e p r o b a b i l i t y t h a t t h e s u m$ $v a l u e o f t h o s e d i g i t s i s z e r o p r o v i d e d t h a t t h e s a m e$ $v a l u e s o f d i g i t s {a r e n}^{'} t a d j a c e n t s ?$

Question Number 180775 Answers: 0 Comments: 7

A box contains 2 blue, 1 red balls. We randomly draw one ball then put it back and add two balls of the same color of that ball in the box. We randomly draw again one ball, if it was red then what′s the probability that the first drawn ball was blue?

$A b o x c o n t a i n s 2 b l u e, 1 r e d b a l l s . W e r a n d o m l y$ $d r a w o n e b a l l t h e n p u t i t b a c k a n d a d d t w o b a l l s$ $o f t h e s a m e c o l o r o f t h a t b a l l i n t h e b o x . W e$ $r a n d o m l y d r a w a g a i n o n e b a l l, i f i t w a s r e d t h e n$ ${w h a t}^{'} s t h e p r o b a b i l i t y t h a t t h e f i r s t d r a w n b a l l$ $w a s b l u e ?$

Question Number 180735 Answers: 1 Comments: 0

A and B throw with 3 dice. if A throws a sum of 16 points, the probability of B throwing a higher sum is pls solve

$A a n d B t h r o w w i t h 3 d i c e . i f A$ $t h r o w s a s u m o f 16 p o i n t s, t h e$ $p r o b a b i l i t y o f B t h r o w i n g$ $a h i g h e r s u m i s$ $p l s s o l v e$

Question Number 180734 Answers: 1 Comments: 0

If f(x)={_(0, othrrwise) ^(2x , 0≤x≤a) is a probability density funtion of a random variable, then a=? pls solve

$I f f (x) = {_{0, o t h r r w i s e}^{2 x, 0 ⩽ x ⩽ a} i s a p r o b a b i l i t y$ $d e n s i t y f u n t i o n o f a r a n d o m$ $v a r i a b l e, t h e n a = ?$ $p l s s o l v e$

Question Number 180733 Answers: 0 Comments: 0

let X have a Bernoulli distribution with mean 0.4 , then the variance of 2X−3 is pls solve

$l e t X h a v e a B e r n o u l l i d i s t r i b u t i o n$ $w i t h m e a n 0.4, t h e n t h e v a r i a n c e$ $o f 2 X - 3 i s$ $p l s s o l v e$

Question Number 180576 Answers: 4 Comments: 1

Question Number 180558 Answers: 1 Comments: 0

The football team meets in a circle to consult about some plan to play, what′s the probability that the one player of the opponent team who′s trying to eavesdrops is standing behind the goalkeeper?

$T h e f o o t b a l l t e a m m e e t s i n a c i r c l e t o c o n s u l t$ $a b o u t s o m e p l a n t o p l a y, {w h a t}^{'} s t h e p r o b a b i l i t y$ $t h a t t h e o n e p l a y e r o f t h e o p p o n e n t t e a m {w h o}^{'} s$ $t r y i n g t o e a v e s d r o p s i s s t a n d i n g b e h i n d t h e$ $g o a l k e e p e r ?$

Question Number 180553 Answers: 1 Comments: 2

Question Number 180340 Answers: 1 Comments: 1

please answer this question i have no idea to post an image. it is sent by mistke.

$p l e a s e a n s w e r t h i s q u e s t i o n$ $i h a v e n o i d e a t o p o s t a n i m a g e . i t i s$ $s e n t b y m i s t k e .$

Question Number 180200 Answers: 4 Comments: 2

A) How many even numbers of 3 different digits bigger than 300 can be formed from {1, 2, 3, 4} B) How many numbers bigger than 300 can be formed from the same group

$A) H o w m a n y e v e n n u m b e r s o f 3 d i f f e r e n t d i g i t s$ $b i g g e r t h a n 300 c a n b e f o r m e d f r o m {1, 2, 3, 4}$ $B) H o w m a n y n u m b e r s b i g g e r t h a n 300 c a n$ $b e f o r m e d f r o m t h e s a m e g r o u p$

Question Number 180192 Answers: 1 Comments: 2

With 3 blue, 2 red and 2 pink beads how many necklaces can be made if there: a• is no clasp b• is a clasp

$W i t h 3 b l u e, 2 r e d a n d 2 p i n k b e a d s h o w m a n y$ $n e c k l a c e s c a n b e m a d e i f t h e r e :$ $a ∙ i s n o c l a s p b ∙ i s a c l a s p$

Question Number 180190 Answers: 1 Comments: 0

Question Number 180186 Answers: 0 Comments: 0

A maintenance manager wishes to repair 8 out of 15 machines down. In how many ways can he create a list of 8 machines a\ If he has to precise the hour of repair of each of them ? b\ If he doesn′t precise the hour of repair of each of them ? c\ Haven chosen the 8 machines, in how many ways can he define the order of repair of each of them ?

$A maintenance manager wishes to repair 8 out of$ $15 machines down . In how many ways can he create$ $a list of 8 machines$ $a ∖ If he has to precise the hour of repair of each of them ?$ $b ∖ If he {doesn}^{'} t precise the hour of repair of each of them ?$ $c ∖ Haven chosen the 8 machines, in how many ways can$ $he define the order of repair of each of them ?$

Question Number 180162 Answers: 0 Comments: 9

How many words can be formed from letters of the “Your answer is wrong”? So that they shouldn′t start with ′o′ neither ′w′ and shouldn′t end with ′w′, and should be′r′ & ′s′ adjacents. Oya...n, Wen...y, Iog...w , Yourws...e : are invalid Enrsow...g : is valid

$H o w m a n y w o r d s c a n b e f o r m e d f r o m l e t t e r s o f t h e$ $‘ ‘ Y o u r a n s w e r i s {w r o n g}^{″} ? S o t h a t t h e y {s h o u l d n}^{'} t$ $s t a r t w i t h^{'} o^{'} n e i t h e r^{'} w^{'} a n d {s h o u l d n}^{'} t e n d$ $w i t h^{'} w^{'}, a n d s h o u l d {b e}^{'} r^{'} &^{'} s^{'} a d j a c e n t s .$ $O y a . . . n, W e n . . . y, I o g . . . w, Y o u r w s . . . e : a r e i n v a l i d$ $E n r s o w . . . g : i s v a l i d$

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