How can i solve , what is 10% of 55?

Mathematics

1 answer:

pantera1 [17]2 years ago

3 0

100 - 55
10 - x
= 5.5
if 100% is 55, what is 10%? multiply 10 by 55 and then divide it by 100

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Suppose the time to complete a 200-meter backstroke swim for female competitive swimmers is normally distributed with a mean μ =

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Answer:

The swimmer must complete the 200-meter backstroke in no more than 130 seconds.

Step-by-step explanation:

Problems of normally distributed samples are solved using 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.

In this problem, we have that:

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