Question: .Compute probabilities for individual observations, using the normal probability distribution. A major department store has determined that its customers charge an average of $500 per

.Compute probabilities for individual observations, using the normal probability distribution.

  • A major department store has determined that its customers charge an average of $500 per month, with a standard deviation of $80. Assume the amounts of charges are normally distributed.

a.

What percentage of customers charges more than $380 per month?

b.

What percentage of customers charges less than $340 per month?

c.

What percentage of customers charges between $644 and $700 per month?

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