Question

Scores on the Wechsler Adult Intelligence Scale(a standard IQ test) for the 20 to 34 age group are approximately bell shaped symmetrical with a mean of 110 and standard deviation of 25. Use the empirical rule to answer the following questions.

a. the scores of the middle 68% of all people lie between what two values?

b. the scores of the middle 95% of all people lie between what two values?

c. the scores of the middle 99.7% of all people lie between what two values?

d. what percent of all people score below 60?

e. what percent of all people score above 135?

f. what percent of all people score between 85 and 135?

Answer #1

The Wechsler Adult Intelligence Scale (WAIS) is a common IQ test
for adults. The distribution of WAIS scores for persons over 16
years of age is approximately normal with mean 100 and standard
deviation 15. Use the 68–95–99.7 rule to answer these
questions.
(a)
What is the probability that a randomly chosen individual has a
WAIS score of 115 or higher?
(b)
In what range do the scores of the middle 95% of the adult
population lie?

The scores on the Wechsler Adult Intelligence Scale are
approximately Normal with mean= 100 and standard deviation=15. The
shortest interval that covers 90% of WISC scores is closest
to...
(80, 129)
(82, 118)
(75, 125)
(73, 119)
(79, 121)

The scores on the Wechsler Adult Intelligence Scale are
approximately Normal with μ = 100 and σ = 15. The proportion of
adults with scores between 85 and 130 is closest to
Group of answer choices
0.819.
0.333.
0.684.
0.997.
0.590.

Scores of an IQ test have a bell-shaped distribution with a
mean of
100
and a standard deviation of
16.
Use the empirical rule to determine the following.
(a) What percentage of people has an IQ score between
68
and
132?
(b) What percentage of people has an IQ score less than
52
or greater than
148?
(c) What percentage of people has an IQ score greater than
132?

Scores of an IQ test have a bell-shaped
distribution with a mean of 100 and a standard deviation of 18.
Use the empirical rule to determine the following.
(a) What percentage of people has an IQ score between
64 and 136?
(b) What percentage of people has an IQ score less
than
64 or greater than 136?
(c) What percentage of people has an IQ score greater
than 136?

Scores of an IQ test have a bell-shaped distribution with a
mean of 100
and a standard deviation of 20.
Use the empirical rule to determine the following.
(a) What percentage of people has an IQ score between 40 and
160?
(b) What percentage of people has an IQ score less than 40 or
greater than 160?
(c) What percentage of people has an IQ score greater than
120?

Scores of an IQ test have a bell-shaped distribution with a mean
of 100 and a standard deviation of 14. Use the empirical rule to
determine the following.
(a) What percentage of people has an IQ score between 72 and 128
?
(b) What percentage of people has an IQ score less than 86 or
greater than 114 ?
(c) What percentage of people has an IQ score greater than 128
?

Scores of an IQ test have a bell-shaped distribution with a
mean of 100 and a standard deviation of 20. Use the empirical rule
to determine the following.
(a) What percentage of people has an IQ score between 40 and
160?
(b) What percentage of people has an IQ score less than 80 or
greater than 120?
(c) What percentage of people has an IQ score greater than
160?

Scores of an IQ test have a bell-shaped distribution with a
mean of 100 and a standard deviation of 20. Use the empirical rule
to determine the following.
(a) What percentage of people has an IQ score between 40 and
160?
(b) What percentage of people has an IQ score less than 60 or
greater than 140?
(c) What percentage of people has an IQ score greater than
140?

Scores of an IQ test have a bell-shaped distribution with a
mean of 100 and a standard deviation of 19. Use the empirical rule
to determine the following. (a) What percentage of people has an
IQ score between 43 and 157? (b) What percentage of people has an
IQ score less than 62 or greater than 138? (c) What percentage of
people has an IQ score greater than 138?

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