JEE Main 2017 — Probability Question with Solution
From: JEE Main 2017 (Offline)
Question
A box contains 15 green and 10 yellow balls. If 10 balls are randomly drawn, one-by-one, with
replacement, then the variance of the number of green balls drawn is :
Choose an option
Show full solutionCorrect option: D
Correct answer
D
Step-by-step explanation
We can apply binomial probability distribution
n = 10
p = Probability of drawing a green ball = =
Also q = 1 - =
Variance = npq
= =
n = 10
p = Probability of drawing a green ball = =
Also q = 1 - =
Variance = npq
= =
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This is a previous-year question from JEE Main 2017, covering the Probability chapter of Mathematics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.