Mia Shillings Department Stores has compiled the following data concerning its
daily sales. The sales for each day of the week are normally distributed with the
following parameters:
Day Mean (μ) in Sh. Standard deviations (σ)
in Sh.
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
120,000
100,000
100,000
120,000
140,000
160,000
20,000
25,000
10,000
40,000
20,000
50,000
Required
Which day of the week has the lowest probability that the store will sell between Sh.
110,000 and Sh. 150,000 worth of goods?