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GrogVix [38]
4 years ago
9

The scores of a given test were normally distributed

Mathematics
1 answer:
julsineya [31]4 years ago
5 0

Answer:

The standard deviation is 6

Step-by-step explanation:

The scores of a given test were normally distributed  with a mean of 82.

\mu = 82

James received a 67 with a z-score of  -2.5

Z score = -2.5

\bar{x}=67

Formula :Z=\frac{x-\mu}{\sigma}

-2.5=\frac{67-82}{\sigma}

\sigma = \frac{67-82}{-2.5}

\sigma =6

Hence The standard deviation is 6

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