SOLUTION: A phone company keeps statistics on the number of messages text that your customers send each month. According to statistics, the number of messages sent per customer in a month ha

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Question 1172896: A phone company keeps statistics on the number of messages text that your customers send each month. According to statistics, the number of messages sent per customer in a month has a normal distribution. The data is shown below.
• The average is 278 messages per month.
• The standard deviation is 19 messages per month.
What is the probability that a customer sends LESS than 316 messages in a month?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
This is z < (316-278)/19 or z < 2
That probability is 0.9772.