The number of text messages that debbies son jeff sends and, Basic Statistics

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The number of text messages that debbies son jeff sends and

The number of text messages that Debbie's son Jeff sends and receives a month follows the normal distribution with a mean of 4,580 (I am not making this up!) and a standard deviation of 550. What is the probability that next month he will send and receive.
a. Between 4,000 and 5,000 text messages?
b. Less than 4,200 text messages?

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