Question

A multiple-choice test consists of 23 questions with possible answers of a, b, c, d. Estimate the probability that with random guessing, the number of correct answers is at least 10.

Solution :

A binomial with ,

n = 23

p = 0.25

P(X 10)

= 1 - BINOM.DIST(9 , 23 , 0.25 , TRUE)

= 0.0408

Probability = 0.0408

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