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Chapter 7: Q.15 (page 428)

Find the percentage of sums between1.5standard deviations below the mean of the sums and one standard deviation above the mean of the sums.

Short Answer

Expert verified

The percentage of sums is 77.45%

Step by step solution

01

Given Information

1.5 standard deviations below the mean of the sums and one standard deviation above the mean of the sums.

02

Explanation

The standard deviation is a measurement of a set of values' variation or dispersion. A low standard deviation implies that the values are close to the set's mean whereas a high standard deviation shows that the values are spread out over a larger range.

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Most popular questions from this chapter

A typical adult has an average IQ score of 105with a standard deviation of 20. If 20randomly selected adults are given an IQ test, what are the probability that the sample mean scores will be between 85 and 125 points?

Use the information in Example 7.8, but use a sample size of 55 to answer the following questions. a. Find P( x ¯ < 7).

b. Find P(Σx > 170).

c. Find the 80th percentile for the mean of 55 scores.

d. Find the 85th percentile for the sum of 55 scores.

What is the z-score for Σx = 840?

An unknown distribution has a mean of 80and a standard deviation of 12. A sample size of 95is drawn randomly from the population.

Find the probability that the sum of the 95values is less than 7400.

The length of time a particular smartphone's battery lasts follows an exponential distribution with a mean of ten months. A sample of 64 of these smartphones is taken.

Find the IQR for the mean amount of time 64 batteries last.
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