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MaRussiya [10]
3 years ago
14

Find the missing number (1+_ ÷7+4)÷8=4/7​

Mathematics
1 answer:
GaryK [48]3 years ago
3 0

The answer to (1+_÷7+4)÷8= 4/7 is -3 I believe

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Dear Math Helper,
valentina_108 [34]

Answer:

n = 98, that is, she scored at the 98th percentile.

Step-by-step explanation:

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

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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.

In this question, we have that:

She scored 38, so X = 38

Test scores are normally distributed with a mean of 25 and a standard deviation of 6.4.

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We have to find the pvalue of Z. So

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Z = \frac{38 - 25}{6.4}

Z = 2.03

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Step-by-step explanation:

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