Question

The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a standard deviation of 7.3905 years. What percentage of individual aircraft have ages between 11 years and 17 years? Assume that a random sample of 64 aircraft is selected and the mean age of the sample is computed. What percentage of sample means have ages between 11 years and 17 years? The percentage of individual aircraft that have ages between 11 years and 17 years is _______ %.

Answer #1

The ages of commercial aircraft are normally distributed with a
mean of
13.5 years and a standard deviation of 6.6519 years. What
percentage of individual aircraft have ages between
11years and17 years? Assume that a random sample of 49 aircraft
is selected and the mean age of the sample is computed. What
percentage of sample mean have ages between 11 years and 17
years?
The percentage of means that have ages between 11 years and 17
years is ____ %...

The ages of commercial aircraft are normally distributed with a
mean of 13.5 years and a standard deviation of 7.2 years. What
percentage of individual aircraft have ages greater than 15 years?
Assume that a random sample of 81 aircraft is selected and the mean
age of the sample is computed. What percentage of sample means have
ages greater than 15 years? The percentage of individual aircraft
that have ages greater than 15 years is nothing%. (Round to the
nearest...

Suppose that the population of surfers in the United States have
ages that are normally distributed with a mean of 28 years and a
standard deviation of 5 years.
- What percentage of surfers are less than 32 years old?
- If a random sample of 60 surfers is taken, what is the
probability that the sample’s average age is between 28 and 29
years old?

Assume that weights of adult females are normally distributed
with a mean of 78 kg and a standard deviation of 21 kg. What
percentage of individual adult females have weights less than 83
kg? If samples of 49 adult females are randomly selected and the
mean weight is computed for each sample, what percentage of the
sample means are less than 83 kg?
The percentage of individual adult females with weights less
than 83 kg is ___%.
The percentage...

question 7.
The ages of all kindergarten children are normally distributed
with mean 3 years and standard deviation 8 months.
If 49 kindergarten children are randomly selected, what is the
probability that their mean age will be younger than 2 years 10
months old?
Use Table A-2 and write your answer as a decimal with 4
decimal places.
Selected Answer 0.9599 was WRONG

IQ scores are normally distributed with a mean of 105 and a
standard deviation of 15. Assume that many samples of size n are
taken from a large population of people and the mean IQ score is
computed for each sample
a. If the sample size is n equals= 64, find the mean and
standard deviation of the distribution of sample
means.
The mean of the distribution of sample means is: 105
The standard deviation of the distribution of sample...

Assume that the heights of women are normally distributed with a
mean of 63.6 inches and a standard deviation of 2.5 inches. a) Find
the probability that if an individual woman is randomly selected,
her height will be greater than 64 inches. b) Find the probability
that 16 randomly selected women will have a mean height greater
than 64 inches.

The ages of a group of 50 women are approximately normally
distributed with a mean of 48 years and a standard deviation of 5
years. One woman is randomly selected from the group, and her age
is observed. a. Find the probability that her age will fall between
56 and 60 years. b. Find the probability that her age will fall
between 47 and 51 years. c. Find the probability that her age will
be less than 35 years. d....

The heights of 18-year-old men are normally distributed, with a
mean of 68 inches and a standard deviation
of 3 inches. If a random sample of 45 men in
this age group is selected, what is the probability that the sample
mean is between 66 and 67.6 inches?

The ages of applicants for management positions at a fast-food
restaurant chain is normally distributed with a mean of 27 and a
standard deviation of 3.464.
a. Define the random variable and its probability
distribution.
b. What is the probability that the next applicant is younger
than 20 years old?
c. What is the probability that the next applicant is between 30
and 40 years old?
d. Twenty percent of the applicants are younger than what
age?

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