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Acceptance Sampling. Exercises 35 and 36 involve the method of acceptance sampling, whereby a shipment of a large number of items is accepted based on test results from a sample of the items.

Aspirin The MedAssist Pharmaceutical Company receives large shipments of aspirin tablets and uses this acceptance sampling plan: Randomly select and test 40 tablets, then accept the whole batch if there is only one or none that doesn鈥檛 meet the required specifications. If one shipment of 5000 aspirin tablets actually has a 3% rate of defects, what is the probability that this whole shipment will be accepted? Will almost all such shipments be accepted, or will many be rejected?

Short Answer

Expert verified

The probability that the shipment will be accepted is equal to 0.662.

This suggests that 66% of such shipments will be accepted, and 33% of the shipments will be rejected.

Since the probability of rejection of shipment is high, the supplier should consider improving the quality of tablets.

Step by step solution

01

Given information

It is given that a shipment is accepted if only one or none of the tablets in a sample of 40 tablets is defective.

02

Required probability 

Let Xdenote the number of defective tablets.

Success is defined as getting a defective tablet.

The probability of success is computed below:

p=3%=3100=0.03

The probability of failure is computed below:

q=1-p=1-0.03=0.07

The number of trials (n) is equal to 40.

The binomial probability formula used to compute the given probability is as follows:

PX=x=nCxpxqn-x

Using the binomial probability formula, the probability that one or none of the tablets are defective is computed below:

PX=0+PX=1=40C00.0300.0740-0+40C10.0310.0740-1=0.2957+0.3658=0.66150.662

Thus, the probability that the shipment will be accepted is equal to 0.662.

03

Determine that all shipments would be accepted or not  

The probability of 0.662 suggests that 66% of such shipments will be accepted, and 33% of the shipments will be rejected.

Since the probability of rejection of shipment is high, the supplier should consider improving the quality of tablets.

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Most popular questions from this chapter

Expected Value for the Ohio Pick 4 Lottery In the Ohio Pick 4 lottery, you can bet \(1 by selecting four digits, each between 0 and 9 inclusive. If the same four numbers are drawn in the same order, you win and collect \)5000.

a. How many different selections are possible?

b. What is the probability of winning?

c. If you win, what is your net profit?

d. Find the expected value for a \(1 bet.

e. If you bet \)1 on the pass line in the casino dice game of craps, the expected value is -1.4垄. Which bet is better in the sense of producing a higher expected value: a \(1 bet in the Ohio Pick 4 lottery or a \)1 bet on the pass line in craps?

In Exercises 21鈥25, refer to the accompanying table, which describes the numbers of adults in groups of five who reported sleepwalking (based on data from 鈥淧revalence and Comorbidity of Nocturnal Wandering In the U.S. Adult General Population,鈥 by Ohayon et al., Neurology, Vol. 78, No. 20).

Find the mean and standard deviation for the numbers of sleepwalkers in groups of five.

x

P(x)

0

0.172

1

0.363

2

0.306

3

0.129

4

0.027

5

0.002

For 100 births, P(exactly 56 girls) = 0.0390 and P(56 or more girls) = 0.136. Is 56 girls in 100 births a significantly high number of girls? Which probability is relevant to answering that question?

Is the random variable given in the accompanying table discreteor continuous? Explain.

Number of Girls x

P(x)

0

0.063

1

0.25

2

0.375

3

0.25

4

0.063

In Exercises 21鈥25, refer to the accompanying table, which describes the numbers of adults in groups of five who reported sleepwalking (based on data from 鈥淧revalence and Comorbidity of Nocturnal Wandering In the U.S. Adult General Population,鈥 by Ohayon et al., Neurology, Vol. 78, No. 20).

Using Probabilities for Identifying Significant Events

a.Find the probability of getting exactly 4 sleepwalkers among 5 adults.

b. Find the probability of getting 4 or more sleepwalkers among 5 adults.

c. Which probability is relevant for determining whether 4 is a significantly highnumber of sleepwalkers among 5 adults: the result from part (a) or part (b)?

d. Is 4 a significantly high number of sleepwalkers among 5 adults? Why

or why not?

x

P(x)

0

0.172

1

0.363

2

0.306

3

0.129

4

0.027

5

0.002

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