The quality-control inspector of a production plant will

Jesse Urbina

Jesse Urbina

Answered question

2022-07-31

The quality-control inspector of a production plant will reject a batch of syringes if two or more defective syringes are found in a random sample of twelve syringes taken from the batch. Suppose the batch contains 1% defective syringes.
 

(b)

Find 𝜇 (in terms of the number of syringes). (Enter a number. Enter your answer to two decimal places.)
𝜇 =         syringes

What is the expected number of defective syringes the inspector will find? (Enter a number. Enter your answer to two decimal places.)


 

(c)

What is the probability that the batch will be accepted? (Enter a number. Round your answer to three decimal places.)


 

(d)

Find 𝜎 (in terms of the number of syringes). (Enter a number. Round your answer to three decimal places.)
𝜎 =  syringes

Answer & Explanation

Jazz Frenia

Jazz Frenia

Skilled2023-05-29Added 106 answers

Given that the batch contains 1% defective syringes and the inspector will reject a batch if two or more defective syringes are found in a random sample of twelve syringes, we can find the mean (μ) and expected number of defective syringes.

To find the mean (μ), we multiply the probability of a defective syringe (p) by the total number of syringes (n):
μ = p * n

Here, p = 1% = 0.01 (probability of a defective syringe)
n = 12 (total number of syringes)

Substituting the values, we have:
μ = 0.01 * 12 = 0.12 syringes

Therefore, the mean (μ) is 0.12 syringes.

To find the expected number of defective syringes, we use the same formula:
Expected number of defective syringes = p * n

Substituting the values, we have:
Expected number of defective syringes = 0.01 * 12 = 0.12

Therefore, the expected number of defective syringes the inspector will find is 0.12.

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