1
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The mean and variance of a binomial distribution are 4 and 2 respectively. Then the probability of exactly two successes is
A
$${7 \over {64}}$$
B
$${{21} \over {128}}$$
C
$${7 \over {32}}$$
D
$${9 \over {32}}$$
2
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Mean of n observations x1, x2, ...., xn is $$\overline x $$. If an observation xq is replaced by xq' then the new mean is
A
$$\overline x - {x_q} + {x_9}'$$
B
$${{(n - 1)\overline x + {x_q}'} \over n}$$
C
$${{(n - 1)\overline x - {x_q}'} \over n}$$
D
$${{n\overline x - {x_q} + {x_q}'} \over n}$$
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