Number of defectives in a random sample, Basic Statistics

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Number of defectives in a random sample

A company that produces DVD drives has a 9% defective rate. Let X represent the number of defectives in a random sample of 51 of their drives.

a) What is the probability the sample will contain exactly 8 defective drives? for this one i found it to be 0.0475 but I don't think that's correct.

b) What is the probability the sample will contain more than 8 defective drives?

c) What is the probability the sample will contain less than 8 defective drives?

d) What is the expected number of defective drives in the sample?

e) What is the variance of the number of defective drives in the sample?

f) What is the standard deviation of the number of defective drives in the sample?

g) Each defective drive costs the company 13 dollars. What is the expected cost to the company for the defective drives in the sample?

h) Each defective drive costs the company 13 dollars. What is the standard deviation of the cost to the company for the defective drives in the sample?

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Basic Statistics: Number of defectives in a random sample

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Basic Statistics: Number of defectives in a random sample

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Recent Questions Asked Basic Statistics

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