# Question: The length of the life of a certain type of

The length of the life of a certain type of refrigerator is approximately normally distributed with a mean of 4.8 years and a standard deviation of 1.3 years.

a. If this machine is guaranteed for 2 years, what is the probability that the machine you purchased will require replacement under the guarantee?

b. What period of time should the manufacturer give as a guarantee if it is willing to replace only 0.5% of the machines?

a. If this machine is guaranteed for 2 years, what is the probability that the machine you purchased will require replacement under the guarantee?

b. What period of time should the manufacturer give as a guarantee if it is willing to replace only 0.5% of the machines?

## Answer to relevant Questions

In a large industrial complex, the maintenance department has been instructed to replace light bulbs before they burn out. It is known that the life of light bulbs is normally distributed with a mean life of 900 hours of use ...Let x be a binomial random variable for n = 30 and p = 0.1. a. Explain why the normal approximation is not reasonable. b. Find the function used to calculate the probability of any x from x = 0 to x = 30. c. Use a computer ...It is believed that 58% of married couples with children agree on methods of disciplining their children. Assuming this to be the case, what is the probability that in a random survey of 200 married couples, we would find a. ...Find the area under the standard normal curve between - 1.39 and the mean, P(_1.39Find the following: a. P(-2.05 < z < 0.00) b. P(-1.83 < z < 2.07) c. P(z < -1.52) d. P(z < -0.43)Post your question