Question

A sample test of 184 transistors contained 6 defective devices. with this failure rate how many transistors can be expected to be unacceptable in a selection of 1288

Answer 1

Answer:

Expected number of unacceptable transistors in a selection of 1288 is 42.

Step-by-step explanation:

The sample size is, n = 184.

Defective devices in this sample is, d = 6.

Compute the probability of defective:

P (Defective) = P (D) $=\frac{d}{n}=\frac{6}{184}= 0.0326$

Compute the expected number of defective devices in a sample of 1288 is:

E (Defective) $=n_[1}\times P(D)=1288\times0.0326=41.988\approx42$

Thus, in a sample of 1288 transistors 42 are unacceptable.