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4 years ago

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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3 years ago

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3 years ago

Two Fifths of the vegetables in Priya's garden are tomatoes.

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Let
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3 years ago

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vitfil [10]

Answer:

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Step-by-step explanation:

$\frac{3x^2 - 1}{x^2 - 1} - \frac{2x + 1}{x + 1}$ $[ \ x^ 2- 1 = (x-1)(x + 1) \ ]$

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