Question

factory makes car batteries. The probability that a battery is defective is 1/14. If 400 batteries are tested, about how many are expected to be defective?
A) 14
B) 371
C) 29
D)35

Answer 1

Since it is 1 out of 14, take 400 and divide it by 14 (400/14) which would give 28.57142857... . So round to the nearest whole number = 29. SO THE ANSWER IS “C, 29”

Answer 2

The required number of defective batteries is 29 out of 400 batteries tested. Option C. is correct.

The probability that a battery is defective is 1/14. The probability that a battery is defective is 1/14. If 400 batteries are tested, how many are expected to be defective s to be determined?

What is probability?

Probability can be defined as the ratio of favorable outcomes to the total number of events. it can be denoted as,
Probability = number of favorable outcomes / total sample space

The probability that a battery is defective given by,
P(D) = 1/14 = 0.072 or 7.2%
400 batteries are tested while multiplying the defective percentage to the number of batteries it gives the defective number of batteries

Number of defective batteries,
= 400 * 7.2%
= 400 * 7.2/100
=≈ 29

Thus, the required number of defective batteries is 29 out of 400 batteries tested. Option C. is correct.



Learn more about probability here:

brainly.com/question/14290572

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