Directions Draw a clearly labeled diagram and then solve eac

Directions: Draw a clearly labeled diagram and then solve each problem.

The mean pulse rate for adults is 72 beats per minute (www.healthepic.com) and let’s suppose that the standard deviation is 10. Find:

a. The probability that a randomly chosen adult has a pulse rate over 80 assuming that the rates are normally distributed.

b. The probability that a random sample of 19 adults will have a mean score over 80.

Using Excel,

P(greater than 80):

=1 - NORMDIST(80, 72, 10, 1)

Thus,

P(greater than 80) = 0.211855399 [ANSWER]

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Using Excel, but this time dividing the standard deviation by sqrt(19),

P(greater than 80):

=1 - NORMDIST(80, 72, 10/sqrt(19), 1)

Thus,

P(greater than 80) = 0.000244127 [ANSWER]