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Based on the graph of this normal distribution

a. The mean is ____

b. The standard deviation is ____

c. 68 % of the data values are between ____ and ____

d. 95 % of the data values are between ____ and ____

e. 99.7 % of the data values are between ____ and ____

Based on the graph of this normal distribution a The mean is b The standard deviation is c 68 of the data values are between

Answer :

The normal distribution based on the graph is:

a) The mean is 91.

b) The standard deviation is 1.

c) 68 % of the data values are between 90 and 92.

e) 99.7 % of the data values are between 87 and 94.

What is the normal distribution?

The standard deviation determines the width of the curve in a normal distribution, which depicts a symmetrical plot of data around its mean value.

From the graph the mean is (x¯) = 91

a) The mean is 91

and Standard Deviation (σ)= (∑(x - x¯)²)

= (70-91)²+ (77-91)² +(84-91)²+(91-91)²+(98-91)²+(105-91)²+(112-91)²

= 1372 / 1371

= 1.0007293946

σ = 1

b) The standard deviation is 1.

if x¯ is the mean and σ is the standard deviation of the distribution, then 68% of the values fall in the range between (x¯−σ) and (x¯+σ).

= (91 -1) (91+1)

= 90 to 92

c) 68 % of the data values are between 90 and 92.

About 95% of the values lie within two standard deviations of the mean, that is, between (x¯−2σ) and (x¯+2σ).

(91-2) to (91+2)

89 to 93

d) 95 % of the data values are between 89 and 93.

About 99.7% of the values lie within three standard deviations of the mean, that is, between (x¯−3σ) and (x¯+3σ) .

(91-3) to (91+3)

87 to 94

e) 99.7 % of the data values are between 87 and 94.

Hence, the normal distribution based on the graph is:

a) The mean is 91.

b) The standard deviation is 1.

c) 68 % of the data values are between 90 and 92.

e) 99.7 % of the data values are between 87 and 94.

To learn more about the normal distribution visit,

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