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Akimi4 [234]
4 years ago
10

The length of time needed to complete a certain test is normally distributed with mean 46 minutes and standard deviation 6 minut

es. Find the probability that it will take less than 37 minutes to complete the test.
Mathematics
1 answer:
madam [21]4 years ago
3 0

Answer:

0.0668 or 6.68%

Step-by-step explanation:

Mean time (μ)= 46 minutes

Standard deviation (σ) = 6 minutes

The z-score for any given time X is determined by:

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

For X = 37:

z=\frac{37-46}{6}\\ z=-1.5

A z-score of -1.5 corresponds to the 6.68th percentile of a normal distribution. The probability that it will take less than 37 minutes to complete the test is

P(X\leq 37) = 0.0668=6.68\%

The probability is 0.0668 or 6.68%

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