Sends and receives a month follows the normal distribution

Reference no: EM131050238

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?

Reference no: EM131050238

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