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.


Question and Answers Forum

All Questions Topic List
Probability and Statistics Questions
Previous in All Question Next in All Question
Previous in Probability and Statistics Next in Probability and Statistics
Question Number 182331 by ali009 last updated on 07/Dec/22

$a b o x c o n t a i n s 5 w h i t e b a l l s a n d s o m e b l a c k$ $b a l l s . i f t h e p r o b a b i l i t y o f d r a w i n g a b l a c k$ $b a l l f r o m t h e b a g i s t w i c e t h e p r b a b i l i t y$ $o f d r a w i m g a w h i t e b a l l t h e n f i n d n u m b e r$ $o f b l a c k b a l l s .$
	Answered by Acem last updated on 07/Dec/22

	$N u m . b l a c k b a l l s = 10 (m e n t a l l y)$ $T h e s o l u t i o n :$ $P (B) = \frac{(T - w)}{T} = \frac{2 w}{T} \Leftrightarrow \frac{T - 5}{T} = \frac{10}{T}, T = 15, B = 10$
Terms of Service
Privacy Policy
Contact: info@tinkutara.com

Question and Answers Forum