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Nezavi [6.7K]
3 years ago
8

What is the opposite of the opposite of -7

Mathematics
2 answers:
dybincka [34]3 years ago
7 0
Opposite number or additive inverse of any number (n) is a number which, if added n is a result of 0, the identity element of addition. The opposite number for n is written as -n. So -7 is opposite to 7.
-7 + 7 = 0
Alex Ar [27]3 years ago
5 0
The answer is -7

no to sure though
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In a sample of 1000 cases, the mean of a certain test is 14 and the standard deviation is 2.5. Assume the distribution to be nor
Maslowich

Answer:

The top 20% of the students will score at least 2.1 points above the mean.

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

The mean of a certain test is 14 and the standard deviation is 2.5.

This means that \mu = 14, \sigma = 2.5

The top 20% of the students will score how many points above the mean

Their score is the 100 - 20 = 80th percentile, which is X when Z has a pvalue of 0.8. So X when Z = 0.84.

Their score is:

Z = \frac{X - \mu}{\sigma}

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X - 14 = 0.84*2.5

X = 16.1

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The top 20% of the students will score at least 2.1 points above the mean.

7 0
2 years ago
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