Question

The amounts of time per workout an athlete uses a stairclimber are normally​ distributed, with a...

The amounts of time per workout an athlete uses a stairclimber are normally​ distributed, with a mean of

2424

minutes and a standard deviation of

66

minutes. Find the probability that a randomly selected athlete uses a stairclimber for​ (a) less than

2121

​minutes, (b) between

2424

and

3333

​minutes, and​ (c) more than

4040

minutes.

​(a) The probability that a randomly selected athlete uses a stairclimber for less than

2121

minutes is

nothing.

​(Round to four decimal places as​ needed.)

​(b) The probability that a randomly selected athlete uses a stairclimber between

2424

and

3333

minutes is

nothing.

​(Round to four decimal places as​ needed.)

​(c) The probability that a randomly selected athlete uses a stairclimber for more than

4040

minutes is

nothing.

​(Round to four decimal places as​ needed.)

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