A manufacturer tested a sample of semiconductor chips and found that 35 were defective and 190 were good.If additional tests are to be conducted with random samples of 160 semiconductor chips,find the mean for the number of defects in these groups of 160 (rounded to nearest whole number).
A)56
B)35
C)29
D)25

Question

Quizplus · Accepted Answer

The probability of getting a defective chip in a single sample is 35/225 (total number of chips). Therefore, the expected number of defects in a sample of 160 chips is 160*(35/225), which is around 25. Therefore, the correct answer is D.

A Manufacturer Tested a Sample of Semiconductor Chips and Found