Questions from Business Statistics

Q: Suppose 17% of the items in a large warehouse are defective

Suppose 17% of the items in a large warehouse are defective. You have chosen a random sample of 350 items to examine in detail. Find the probability that more than 20% of the sample is defective.

Q: You have just sent out a test mailing of a catalog to

You have just sent out a test mailing of a catalog to 1,000 people randomly selected from a database of 12,320 addresses. You will go ahead with the mass mailing to the remaining 11,320 addresses prov...

Q: You expect a mean of 1,671 warranty repairs next month

You expect a mean of 1,671 warranty repairs next month, with the actual outcome following a Poisson distribution. a. Find the standard deviation of the number of such repairs. b. Find the probability...

Q: If tomorrow is a typical day, your human resources division will

If tomorrow is a typical day, your human resources division will expect to receive resumes from 175 job applicants. You may assume that applicants act independently of one another. a. What is the name...

Q: On a given day, assume that there is a 30%

On a given day, assume that there is a 30% chance you will receive no orders, a 50% chance you will receive one order, a 15%chance of two orders, and a5% chance of three orders. Find the expected numb...

Q: On a typical day, your clothing store takes care of 2

On a typical day, your clothing store takes care of 2.6 “special customers” on average. These customers are taken directly to a special room in the back, are assigned a full-time server, are given tea...

Q: Customers arrive at random times, with an exponential distribution for the

Customers arrive at random times, with an exponential distribution for the time between arrivals. Currently the mean time between customers is 6.34 minutes. a. Since the last customer arrived, 3 minut...

Q: For the annual salary levels: a. Find the average

For the annual salary levels: a. Find the average. b. Find the median. c. Construct a histogram, and give an approximate value for the mode. d. Compare these three summary measures. What do they tell...

Q: In the situation described in the previous problem, a customer has

In the situation described in the previous problem, a customer has just arrived. a. Find the probability that the time until the arrival of the next customer is less than 3 minutes. b. Find the probab...

Q: Assuming the appropriate probability distribution for the situation described in the preceding

Assuming the appropriate probability distribution for the situation described in the preceding problem: a. Find the probability that the system will last 100,000 hours or more (twice the average lifet...