Question

A shipment of 7 microwave ovens contains 2 defective units. A restaurant buys three of these units. What is the probability of the restaurant buying at least two nondefective​ units? The probability of the restaurant buying at least two nondefective units is nothing. ​(Round to three decimal places as​ needed.)

Answer 1

Given

N=7

k=5

n=3

let X: number of non defective units selected in sample ( without replacement)

since the sample is drawn without replacement ,Here we use hypergeometric distribution

X ~ Hypergeometric (N=7, k=5,n=3)

inn thed total no of-microudH-7 N-k= no ot detectiv. Aon 6 2 2 7 3 5 .857 /

ANSWER = 0.857