Use the following list of resting pulse rates of 55 people. The mean of these rates is 73.5, and the standard deviation is approximately 13.2.50, 51, 51, 53, 53, 53, 55, 56, 56, 57, 58, 58, 59, 59, 6060, 60, 60, 62, 62, 64, 65, 65, 65, 68, 68, 69, 71, 71, 7272, 73, 75, 76, 77, 78, 78, 81, 81, 81, 82, 82, 82, 82, 8385, 85, 85, 88, 88, 90, 90, 91, 91, 92Determine the pulse rates that are within 1 standard deviation of the mean. What percentage of the total to the nearest 0.1 percent do these rates represent?

54.5%

Step-by-step explanation:

Given that :

Mean pulse rate (m) = 73.5

Standard deviation (σ) = 13.2

Pulse rates within 1 standard deviation of the mean :

Mean ± 1(standard deviation )

73.5 - 13.2 < X < 73.5 + 13.2

60.3 < X < 86.7

Pulse rates : 50, 51, 51, 53, 53, 53, 55, 56, 56, 57, 58, 58, 59, 59, 6060, 60, 60, 62, 62, 64, 65, 65, 65, 68, 68, 69, 71, 71, 7272, 73, 75, 76, 77, 78, 78, 81, 81, 81, 82, 82, 82, 82, 8385, 85, 85, 88, 88, 90, 90, 91, 91, 92

Total number pulse rate within 1 standard deviation of the mean = 30

Percentage of the total :

(30 / 55) * 100%

0.5454 * 100%

= 54.54%

= 54.5%

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

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step-by-step explanation:

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