The Total solution for NCERT class 6-12
Answer - 21 : -
From alot of 15 bulbs which include 5 defective, sample of 4 bulbs is drawn one by one withreplacement. Find the probability distribution of number of defective bulbs.Hence, find the mean of the distribution.
Answer - 22 : -
Out of15 bulbs 5 are defective.
A dieis thrown three times. Let X be' the number of twos seen'. Find the expectation ofX.
Answer - 23 : -
A dieis thrown twice. A 'success' is getting an even number on a toss. Find thevariance of number of successes.
Answer - 24 : -
Threecards are drawn successively with replacement from a well shuffled pack of 52cards. Find the probability of the number spades. Hence, find the mean of thedistribution.
Answer - 25 : -