How many students sleep times between a given range

Reference no: EM13127148

A survey of 260 students at a university showed that the mean sleep time for the students was 405 minutes per night with a standard deviation of 50 minutes. Assume that the histogram of the data is approximately bell-shaped.

Approximately how many of the 260 students had sleep times between 355 minutes and 455 minutes per night?

Reference no: EM13127148

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