Answer to Question #104448 in Statistics and Probability for yolande Leibbrandt

Question

A company makes electric motors. On average there are 3 defective motors per every 300. What is the probability that a sample of 300 electric motors will contain exactly 5 defective motors

Answer 1

This is a binomial problem with P= 0.01 and n=300.

P(=5) can be solved using BINOM.DIST excel function.The formula is =BINOM.DIST(5,300,0.01,FALSE) which gives 0.100985.