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Amanda [17]
3 years ago
11

An athletics coach states that the distribution of player run times (in seconds) for a 100-meter dash is normally distributed wi

th a mean equal to 13.00 and a standard deviation equal to 0.2 seconds. What percentage of players on the team run the 100-meter dash in 13.36 seconds or faster
Mathematics
1 answer:
MissTica3 years ago
6 0

Answer:

96.41% of players on the team run the 100-meter dash in 13.36 seconds or faster

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.

In this question, we have that:

\mu = 13, \sigma = 0.2

What percentage of players on the team run the 100-meter dash in 13.36 seconds or faster

We have to find the pvalue of Z when X = 13.36.

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

Z = \frac{13.36 - 13}{0.2}

Z = 1.8

Z = 1.8 has a pvalue of 0.9641

96.41% of players on the team run the 100-meter dash in 13.36 seconds or faster

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