Chapter 7: Q.16 (page 428)
Find the probability that the sum of the values is greater than .
Short Answer
The probability that the sum of the values is greater than is.
Chapter 7: Q.16 (page 428)
Find the probability that the sum of the values is greater than .
The probability that the sum of the values is greater than is.
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Get started for freeA typical adult has an average IQ score of with a standard deviation of . If randomly selected adults are given an IQ test, what are the probability that the sample mean scores will be between and points?
Previously, De Anza statistics students estimated that the amount of change daytime statistics students carry is exponentially distributed with a mean of . Suppose that we randomly pick daytime statistics students.
a. In words,
b.
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d.
e. Find the probability that an individual had between . Graph the situation, and shade in the area to be determined.
f. Find the probability that the average of the 25 students was between . Graph the situation, and shade in the area to be determined.
g. Explain why there is a difference in part e and part f.
Find the probability that the sum of the values is less than .
Find the probability that the sum of the values falls between the numbers you found in and.
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.
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