Question

1. Determine the area under the standard normal curve that lies between the following values. z=1 and z=2 2.Find the area under the standard normal curve to the right of z=1. 3. Assume that the random variable X is normally​ distributed, with mean mu equals 80 and standard deviation sigma equals 10. Compute the probability ​P(X>88​).

2. Determine the area under the standard normal curve that lies between the following values. z=1 and z=2

3. A new phone system was installed last year to help reduce the expense of personal calls that were being made by employees. Before the new system was​ installed, the amount being spent on personal calls followed a normal distribution with an average of $800 per month and a standard deviation of​ $50 per month. Refer to such expenses as​ PCE's (personal call​ expenses). Using the distribution​ above, what is the probability that a randomly selected month had a PCE of between $675and $890?

Answer 1