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Paha777 [63]
3 years ago
7

Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 22 days and

a standard deviation of 6 days. 72% of all of these types of trials are completed within how many days
Mathematics
1 answer:
Alika [10]3 years ago
6 0

Answer:

25.5 days

Step-by-step explanation:

Mean number of days (μ) = 22 days

Standard deviation (σ) = 6 days

Z-score for the 72nd percentile (according to tabulated values) = 0.583

The z-score for any number of days, X, is determined by:

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

The value of X that is greater than 72% of the trial times is:

0.583=\frac{X-22}{6}\\ X=25.5\ days

Therefore, 72% of all of these types of trials are completed within 25.5 days.

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