Question

1. Find P(- 1.68 < Z < 1.68)

Group of answer choices

A. .9535

B. .9070

C. .0465

D. .4535

2. A study of homeowners in the 5th congressional district in
Maryland found that their annual

household incomes are normally distributed with a mean of $41,182
and a standard deviation of $11,990

(based on data from Nielsen Media Research).

What percentage of household incomes are greater than
$30,000?

Group of answer choices

A. 31.42%

B. 82.45%

C. 32.45%

D. 17.55%

3. Suppose the weights of newborn babies at ABC hospital are normally distributed with a mean of 7.6 pounds with a standard deviation of 2.3 pounds

a.) Find the z-score of a baby that weighs 10.5 pounds.

b.) Find the probability that a baby weighs less than 10.5 pounds.

4. Let's suppose the average temperature of Covid-19 patients on day 4 is 102.3 degrees Fahrenheit with a standard deviation of 1.8 degrees. Assume the distribution is normally distributed. Find the temperatures of the middle 40%. Round answer(s) to two decimal places.

Answer #1

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The confidence coefficient for a 95% confidence interval is z =
1.645.
Group of answer choices
True
False
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Question 21 pts
When using the t-distribution to construct a confidence interval
on the population mean, the degrees of freedom are n - 1.
Group of answer choices
True
False
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Question 31 pts
For n = 121, sample mean = 96 and a known population standard
deviation σ = 14, construct a 95% confidence interval for...

1. Find P(Z < -1.54). Round off to 4 decimal
places.
2. Find P(Z > 1.45). Round off to 4 decimal
places.
3. Find P(-1.54 < Z < 1.45). Round off to 4
decimal places.
4. The monthly electric bills in a city are normally
distributed with a mean of $125 and a standard deviation of $22.
Find the x-value corresponding to a z-score of 1.65.
5. Find z if P(Z < z) = 0.028.
6. The weights of bags...

A. For a standard normal distribution, find:
P(-1.14 < z < -0.41)
B. For a standard normal distribution, given:
P(z < c) = 0.0278
Find c.
C. For a standard normal distribution, find:
P(z > c) = 0.4907
Find c.
D. Assume that z-scores are normally distributed with a mean
of 0 and a standard deviation of 1.
IfP(0<z<a)=0.4686P(0<z<a) = 0.4686
find a.
E. Assume that the readings at freezing on a bundle of
thermometers are normally distributed with a...

Please do all three questions
1. Find P (0.2 < Z < 1.63) where Z is the standard normal
variable.
2. Find x such that P(X > x) = 0.2 where X is normally
distributed with mean 1 and standard deviation 2.6
3. The distribution of heights of adult males is normally
distributed with mean 65 inches and standard deviation 2.3 inches.
Answer the following.
(a) What minimum height is taller than 70% of all adult
males?
(b) What two...

1. P(z<-2.12)= ?
2. P(z=2.6)=?
3. P(z>-3)=?
4. P(z<-2.36)=?
5. p(z>-0.24)=?
6. P(-1.88<z<1.65)=?
7. The mean amount of sleep needed for adults is 509 minutes per
night. If the standard deviation for adult sleepers is 47. What is
the Z score associated with sleeping 556 minutes per night? Round
your answer to the nearest thousandth.
8. The mean amount of sleep needed for adults is 502 minutes per
night. If the standard deviation for adult sleepers is 43. What is...

2.)Assume random variable Z follows standard normal
distribution; find the value of the following probabilities.
P(-1<Z<1)
3.)Assume random variable Z follows standard normal
distribution; find the value of the following probabilities.
P(0<Z<1)
4.)Assume random variable Z follows standard normal
distribution; find the value of the following probabilities.
P(Z>2)
5.)The natural log of growth of yucca tree is approximately
normally distributed with mean of 0.053 mm and standard deviation
0.03mm. Determine the probability that a yucca tree has growth less
than...

1. For a standard normal distribution,
find:
P(z > 2.32)
Keep four decimal places.
2. For a standard normal distribution,
find:
P(-0.9 < z < 0.95)
3. For a standard normal distribution,
given:
P(z < c) = 0.7622
Find c.
4. For a standard normal distribution,
find:
P(z > c) = 0.1753
Find c
5. Assume
that the readings at freezing on a batch of thermometers
are normally distributed with a mean of 0°C and a standard
deviation of 1.00°C....

1. For a standard normal distribution,
find:
P(-1.36 < z < 1.08)
2. For a standard normal distribution,
find:
P(z > 1.42)
3. GPAs at CCCOnline are normally distributed
with a mean of 2.44 and a standard deviation of 0.55. Find the
zz-score for a GPA of 2.82.
0.3091
0.6909
1.200
1.745
0.4909
0.7091

Use the z-score table to answer the question. Note:
Round z-scores to the nearest hundredth and then find the
required A values using the table.
A psychologist finds that the intelligence quotients of a group of
patients are normally distributed, with a mean of 99 and a standard
deviation of 16. Find the percent of the patients with the
following IQs.
(a) above 111
(b) between 87 and 117

1. The weights of a certain dog breed are approximately normally
distributed with a mean of ? = 46 pounds, and a standard deviation
of ? = 7 pounds.
A) A dog of this breed weighs 51 pounds. What is the dog's
z-score? Round your answer to the nearest hundredth as needed. z
=
B) A dog has a z-score of -0.8. What is the dog's weight? Round
your answer to the nearest tenth as needed. ____ pounds
C) A...

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