Question

14. A sample of size 82 will be drawn from a population with mean 24 and standard deviation 9

.a. Find the probability that will be less than 26

Answer #1

A sample of size 15will be drawn from a population with mean 135
and standard deviation 36
.
(a) Is it appropriate to use the normal distribution to find
probabilities for x?
(b) If appropriate find the probability that X will be
less than 118
.
(c) If appropriate find the
90th percentile of x
A sample of size 15will be drawn from a population with mean 135
and standard deviation 36
.
(a) Is it appropriate to use the normal...

A sample average of size 14 is drawn from a normally
distributed population and has a mean of 77 and a standard
deviation of 14. Find the lower end, if 95% of all possible sample
averages?

1. A sample size of 49 drawn from a population with a mean of 36
and a standard deviation of 15 for the size of an English class.
What is the probability the class will have greater than 40
a. .9693
b. .4693
c. .0808
d. .0307
2. A sample size of 49 drawn from a population with a mean of 36
and a standard deviation of 15 for the size of an English class.
What is the probability the...

A sample of size
126
will be drawn from a population with mean
26
and standard deviation
3
. Use the TI-84 calculator.
Part 1 of 2
Find the probability that
x
will be between
25
and
27
. Round the answer to four decimal places.
The probability that
x
will be between
25
and
27
is .
Part 2 of 2
Find the
55th
percentile of
x
. Round the answer to two decimal places.
The
55th
percentile is...

A simple random sample of size n = 14 is drawn from a population
that is normally distributed. The sample mean is found to be x = 56
and the sample standard deviation is found to be s = 11. Construct
a 90% confidence interval about the population mean. The 90%
confidence interval is

A sample of size 8 will be drawn from a normal population with
mean 61 and standard deviation 14.
(a) Is it appropriate to use the normal distribution to find
probabilities for x?
(b) If appropriate find the probability that x will be between
51 and 71. Round the answer to four decimal places.
(c) If appropriate find the 81st percentile of x.
Round the answer to two decimal places.

A simple random sample of size n =24 is drawn from a population
that is normally distributed. The sample mean is found to be x
overbar equals 58 and the sample standard deviation is found to be
s=12. Construct a 90% confidence interval about the population
mean.
The lower bound is?
The upper bound is?

A sample of size 37 will be drawn from a population with mean 45
and standard deviation 9. Use the TI-84 Plus calculator.
(a) Is it appropriate to use the normal distribution to find
probabilities for x?
(b) Find the probability that x will be between 46 and 47. Round
the answer to at least four decimal places.
(c) Find the 39th percentile of x. Round the answer to at least
two decimal places.
a)
Is it appropriate to use...

A sample of size 35 will be drawn from a population with mean 43
and standard deviation 10.
a) is it appropriate to use normal distribution to find
probability?
b) find the probability that x will be between 44 and 45. Round
to at least 4 decimal places.
c) find the 37th percentile of x. round to at least
two decimal places.

1. A sample size of 80 will be drawn from a population
with mean 20 and standard deviation 15. Find the probability that
x̄ will be between 18 and 21.
A) 0.6087 B) 0.5841 C) 0.1170 D) 0.2743
2. A certain car model has a mean gas mileage of 29
miles per gallon (mpg) with a standard deviation 5 mpg. A pizza
delivery company buys 47 of these cars. What is the probability
that the average mileage of the fleet...

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