JEE Main 2019 — Probability Question with Solution
From: JEE Main 2019 (Online) 11th January Evening Slot
Question
A bag contains 30 white balls and 10 red balls. 16 balls are drawn one by one randomly from the bag with replacement. If X be the number of white balls drawn, then is equal to :
Choose an option
Show full solutionCorrect option: D
Correct answer
D
Step-by-step explanation
p (probability of getting white ball) =
q = and n = 16
mean = np = 16. = 12
and standard diviation
= =
= =
q = and n = 16
mean = np = 16. = 12
and standard diviation
= =
= =
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This is a previous-year question from JEE Main 2019, 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.