Questions from Business Statistics

Q: An employer pays a mean salary for a 5-day workweek

An employer pays a mean salary for a 5-day workweek of $1250 with a standard deviation of $129. On the weekends, his salary expenses have a mean of $450 with a standard deviation of $57. What is the m...

Q: A golfer keeps track of his score for playing nine holes of

A golfer keeps track of his score for playing nine holes of golf (half a normal golf round). His mean score is 85 with a standard deviation of 11. Assuming that the second 9 has the same mean and stan...

Q: The life span of a calculator battery is Normally distributed with a

The life span of a calculator battery is Normally distributed with a mean of 45 hours and a standard deviation of 5 hours. What is the probability that a battery lasts more than 53 hours?

Q: An automatic filling machine in a factory fills bottles of ketchup with

An automatic filling machine in a factory fills bottles of ketchup with a mean of 16.1 oz and a standard deviation of 0.05 oz with a distribution that can be well modeled by a Normal model. What is th...

Q: Do these situations involve Bernoulli trials? Explain. 1.

Do these situations involve Bernoulli trials? Explain. 1. We roll 50 dice to find the distribution of the number of spots on the faces. 2. How likely is it that in a group of 120 the majority may have...

Q: In an effort to check the quality of their cell phones,

In an effort to check the quality of their cell phones, a manufacturing manager decides to take a random sample of 10 cell phones from yesterday production run, which produced cell phones with serial...

Q: Lifetimes of electronic components can often be modeled by an Exponential model

Lifetimes of electronic components can often be modeled by an Exponential model. Suppose quality control engineers want to model the lifetime of a hard drive to have a mean lifetime of 3 years. 1. Wha...

Q: Below is a back-to-back stem-and-

Below is a back-to-back stem-and-leaf display that shows two datasets at once one going to the left, one to the right. The display compares the percent change in population for two regions of the Unit...

Q: Suppose occurrences of sales on a small company website are well modeled

Suppose occurrences of sales on a small company website are well modeled by a Poisson model with λ=5/hour. 1. If a sale just occurred, what is the expected waiting time until the next sale? 2. What i...

Q: Do these situations involve Bernoulli trials? Explain. 1.

Do these situations involve Bernoulli trials? Explain. 1. You are rolling 5 dice and need to get at least two 6 to win the game. 2. We record the distribution of eye colors found in a group of 500 peo...