1.)Find the percent of juniors whose score is no more than 90.   2.)Find the percent of juniors whose score is between 58 and 74.

The temperature control unit on a commercial freezer in a 24-hour grocery store is set to maintain a mean temperature of 24o F. The temperature varies because people are constantly opening the freezer...

Suppose the height of college students is normally distributed with a mean of 70.2 inches and a standard deviation of 5.3 inches.   If 50 students from that college are randomly...

Suppose that a committee is studying whether or not there is waste of time in our judicial system. It is interested in the mean amount of time individuals waste at the courthouse waiting to be called...

A machine fills bags of candy. Due to slight irregularities in the operation of the machine, not every bag gets exactly the same number of pieces. Assume that the number of pieces per bag is normally...

Find the value of the following probability in the standards normal distribution.   a.  P(Z<0.5) b.  P(Z< -0.35) c.  P(0.68<Z<2.02)