Question

A normal population has a mean of 77 and a standard deviation of 8. You select a sample of 36. Use Appendix B.1 for the z-values. Compute the probability that the sample mean is: (Round the z-values to 2 decimal places and the final answers to 4 decimal places.) a. Less than 74. Probability b. Between 74 and 80. Probability c. Between 80 and 81. Probability d. Greater than 81. Probability

Answer #1

A normal population has a mean of 78 and a standard deviation of
9. You select a sample of 57. Use Appendix B.1 for the
z-values.
Compute the probability that the sample mean is: (Round
the z-values to 2 decimal places and
the final answers to 4 decimal
places.)
a. Less than 77.
Probability
b. Between 77 and 79.
Probability
c. Between 79 and 81.
Probability
d. Greater than 81.
Probability

A normal population has a mean of 77 and a standard deviation of
5. You select a sample of 48.
Compute the probability that the sample mean is: (Round
your z values to 2 decimal places and final answers to 4
decimal places.)
A. less than 76
Probability:
B. Between 76 and 78
Probability:
C. Between 78 and 79
Probability:
D. Greater than 79
Probability:

A normal population has a mean of 89 and a standard deviation of
8. You select a sample of 35. Use Appendix B.1 for the z-values.
Compute the probability that the sample mean is: (Round the
z-values to 2 decimal places and the final answers to 4 decimal
places.)
a. Less than 87.
Probability
b. Between 87 and 91
Probability
c. Between 91 and 92.
Probability
d. Greater than 92.
Probability

A normal population has a mean of 61 and a standard deviation of
4. You select a sample of 38.
Compute the probability that the sample mean is: (Round
your z values to 2 decimal places and final answers to 4
decimal places.)
Less than 60.
Between 60 and 62.
Between 62 and 63.
Greater than 63.

A normal population has a mean of 10.2 and a standard deviation
of 1.4. Refer to the table in Appendix B.1. a. Compute the z-value
associated with 14.3. (Round the final answer to 2 decimal places.)
z = b. What proportion of the population is between 10.2 and 14.3?
(Round z-score computation to 2 decimal places and the final answer
to 4 decimal places.) Proportion c. What proportion of the
population is less than 10.0? (Round z-score computation to 2...

A normal population has a mean of 11.8 and a standard deviation
of 4.6. Refer to the table in Appendix B.1.
a. Compute the z-value associated with
14.3. (Round the final answer to 2 decimal
places.)
z =
b. What proportion of the population is between
11.8 and 14.3? (Round z-score computation to 2
decimal places and the final answer to 4 decimal
places.)
Proportion
c. What proportion of the population is less
than 10.0?...

A normal population has a mean of 21 and a standard deviation of
3. Use Appendix B.3.
Compute the z value associated with 27. (Round your answer to 2
decimal places.) What proportion of the population is between 21
and 27? (Round z-score computation to 2 decimal places and your
final answer to 4 decimal places.)
What proportion of the population is less than 18? (Round z-score
computation to 2 decimal places and your final answer to 4 decimal
places.)

A normal population has a mean of 65 and a standard deviation of
13. You select a random sample of 25.
Round to 4 decimal places.
a.
19% of the time, the sample average will be less than what
specific value?
Value
b.
19% of the time, the value of a randomly selected observation
will be less than h. Find h.
h
c.
The probability that the sample average is more than k is 36%.
Find k....

The mean of a population is 76 and the standard deviation is 13.
The shape of the population is unknown. Determine the probability
of each of the following occurring from this population.
a. A random sample of size 36 yielding a sample
mean of 78 or more
b. A random sample of size 120 yielding a sample
mean of between 75 and 79
c. A random sample of size 219 yielding a sample
mean of less than 76.7
(Round all...

A normal population has a mean of 20.0 and a standard deviation
of 4.0.
a). Compute the z value associated with 25.0. (Round
your answer to 2 decimal places.)
b). What proportion of the population is between 20.0 and 25.0?
(Round z-score computation to 2 decimal places and
your final answer to 4 decimal places.)
c). What proportion of the population is less than 18.0?
(Round z-score computation to 2 decimal places and
your final answer to 4 decimal places.)

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