The number of music cds sold weekly by a store follows a normal distribution with a mean of 455 and a standard deviation of 65. which sentence summarizes this information? . a. there is an 84% chance that the shop sells more than 390 cds in a week. b. there is a 34% chance that the shop sells more than 390 cds in a week.. c. there is a 34% chance that the shop sells fewer than 390 cds in a week.. d. there is a 68% chance that the shop sells fewer than 390 cds in a week.. e. there is a 95% chance that the shop sells more than 390 cds in a week.

A. There is an 84% chance that the shop sells more than 390 CDs in a week.

Step-by-step explanation:

The number of music CDs sold weekly by a store follows a normal distribution with a mean of 455 and a standard deviation of 65.

Hint- First we will have to calculate the z score and then using z score table we can calculate the probability or area below that point.

Z score can be calculated by the following formula,

Where,

X = the raw score,

μ = mean of the sample

σ = standard deviation,

Putting the values,

From the z score table, we get

As from the table we get the probability less than the point which in case is 390 with z score of -1, the probability more with z score more than -1, is