Finding Areas within a Normal Distribution Answers

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The graph shows the distribution of weights (in pounds) of male duck-billed platypuses. The distribution is approximately Normal, with a mean of 3.75 pounds and a standard deviation of 0.52 pounds.

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A
34%
B
68%
C
95%
D
99.7%
3

The graph shows the distribution of the amount of chicken (in ounces) that adults eat in one sitting.

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A
The distribution is approximately Normal, with a mean of 8 ounces and a standard deviation of –1.2 ounces.
B
The distribution is approximately Normal, with a mean of 8 ounces and a standard deviation of 1.2 ounces.
C
The distribution is approximately Normal, with a mean of 1.2 ounces and a standard deviation of 8 ounces.
D
The distribution is uniform, with a mean of 8 ounces and a standard deviation of 1.2 ounces.
4

The graph shows the distribution of the number of text messages young adults send per day. The distribution is approximately Normal, with a mean of 128 messages and a standard deviation of 30 messages.

Question illustration
A
34%
B
47.5%
C
81.5%
D
95%
5

The graph shows the distribution of the number of text messages young adults send per day. The distribution is approximately Normal, with a mean of 128 messages and a standard deviation of 30 messages.

Question illustration
A
34%
B
50%
C
66%
D
68%
6

The graph shows the distribution of the amount of chicken (in ounces) that adults eat in one sitting. The distribution is approximately Normal, with a mean of 8 ounces and a standard deviation of 1.2 ounces.

Question illustration
A
4.4 ounces
B
5.6 ounces
C
10.4 ounces
D
11.6 ounces
7

The graph shows the distribution of the length (in seconds) of videos on a popular video-streaming site. The distribution is approximately Normal, with a mean of 264 seconds and a standard deviation of 75 seconds.

Question illustration
A
50%
B
68%
C
97.35%
D
99.7%
9

The graph shows the distribution of the lengths (in seconds) of videos on a popular video-streaming site. The distribution is approximately Normal, with a mean of 264 seconds and a standard deviation of 75 seconds.

Question illustration
A
39 seconds
B
114 seconds
C
189 seconds
D
339 seconds

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