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Novosadov [1.4K]
3 years ago
10

The scores on a test are normally distributed with a mean of 30 and a standard deviation of 6. Find the score that is one dash h

alf a standard deviation above the mean.
Mathematics
1 answer:
Mashcka [7]3 years ago
4 0

Answer:

Step-by-step explanation:

If it is asking for 1.5 standard deviations above the mean, it is 30 +1.5(6)=39

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Four students were scheduled to give book reports in 1 hour. After the first report, 2/3 hour remained. The next two reports too
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3 0
3 years ago
Running times for 400 meters are Normally distributed for young men between 18 and 30 years of age with a mean of 93 seconds and
Luda [366]

Answer:

C. 45 and 141 seconds

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviation of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean = 93 seconds

Standard deviation = 16 seconds

99.7% of running times are approximately between:

By the Empirical rule, within 3 standard deviations of the mean, so between 3 standard deviations below the mean and 3 standard deviations above the mean

3 stnadard deviations below the mean

93 - 3*16 = 45 seconds

3 standard deviations above the mean

93 + 3*16 = 141 seconds

The correct answer is:

C. 45 and 141 seconds

3 0
3 years ago
Tell whether the given value is a solution of the inequality
topjm [15]

Answer:

the given value <u>is</u> a solution of the inequality

Step-by-step explanation:

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2 years ago
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4 0
3 years ago
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