Answer:
The probability that if 13 loaves are selected the mean price is less than $1.00 is:

Explanation:
Let's say that μ is the average price of the loaves.
μ is the population mean. μ = $1.37
is the standard deviation and

Then we take a sample of size n = 13
Where
is the is the sample mean.
is the standard deviation of the sample
By definition:


We look for the probability that the mean of the sample is less than $ 1.00
This is:

Now we find the standard statistic standard Z.

By symmetry of the standard normal distribution:

Looking in the standard normal table we get
