Question

The weights of baby giraffes are known to have a mean of 125 pounds and a standard deviation of 15 pounds.

If we obtained a random sample of 40 baby giraffes,

- what is the probability that the sample mean will be between 120 and 130 pounds?
- what is the 75th percentile of the sample means of size n=40?

Answer #1

The standard deviation of the weights of elephants is known to
be approximately 15 pounds. We wish to construct a 95% confidence
interval for the mean weight of newborn elephant calves. Fifty
newborn elephants are weighed. The sample mean is 244 pounds. The
sample standard deviation is 11 pounds.
Identify the following: x¯ = σ = n =
In words, define the random variables X and X¯.
Construct a 95% confidence interval for the population mean
weight of newborn elephants....

The standard deviation of the weights of elephants is known to
be approximately 15 pounds. We wish to construct a 95% confidence
interval for the mean weight of newborn elephant calves. Fifty
newborn elephants are weighed. The sample mean is 244 pounds. The
sample standard deviation is 11 pounds.
A) Construct a 95% confidence interval for the population mean
weight of newborn elephants.
B) What will happen to the confidence interval obtained, if 500
newborn elephants are weighed instead of...

O Baby! The weights of 3-month-old baby girls
are normally distributed with a mean of 12.9 pounds and a standard
deviation of 1.6. In an inner city pediatric facility, a random
sample of 16 3-month-old baby girls was selected and their weights
were recorded.
a. What is the probability that the average weight of the 16
baby girls is more than 14 pounds?
b. What is the probability that the average weight of the 16
baby girls is less than...

assume that in a particular region, wild salmon have an average
weight of 5 pounds with a standard deviation of 1.6 pounds.
a. Find the probability that a salmon's weight is between 4.1
pounds and 5.5 pounds.
b. Find P80, the 80th percentile of salmon weights.
c. Assume that a sample of 25 salmon is randomly taken from the
preceding population and the mean of their weights recorded. Give
the mean μx and the standard deviation σx of the sample...

It is known that the birth weight of newborn babies in
the U.S. has a mean of 7.1 pounds with a standard deviation of 1.5
pounds. Suppose we randomly sample 36 birth certificates from the
State Health Department, and record the birth weights of these
babies.
The sampling distribution of the average birth weights
of random samples of 36 babies has a mean equal to ______ pounds
and a standard deviation of ______ pounds.
What is the probability the...

It is known that the birth weight of newborn babies in the U.S.
has a mean of 7.1 pounds with a standard deviation of 1.5 pounds.
Suppose we randomly sample 36 birth certificates from the State
Health Department, and record the birth weights of these
babies.
The sampling distribution of the average birth weights of
random samples of 36 babies has a mean equal to ______
pounds and a standard deviation of ______ pounds.
What is the probability the average...

baby weights following are weights in pounds for random samples
of 15 newborn baby boys and baby girls born in Denver in 2011.
boxplot indicates that the samples come from populations that are
approximately normal. let u1 denote the mean weught of boys and u2
denoted the mean weight of girls. can you conclude that the mean
weight of boys is less than the mean weight of girls? use
alpha=0.01 level and p value method with the tble boys:
5.9,6.4,7.3,6.6,7.6,7.5,6.9,7.4,6.4,6.9,6.3,6.4,6.4,7.4,7.7...

Baby weights: The weight of male babies less than 2 months old
in the United States is normally distributed with mean 12 pounds
and standard deviation 3.7 pounds. Use the Cumulative Normal
Distribution Table to answer the following.
(a) Find the 84th percentile of the baby weights.
(b) Find the 13th percentile of the baby weights.
(c) Find the first quartile of the baby weights.

Suppose that the birth weights of infants are Normally
distributed with mean 120 ounces
and a standard deviation of 18 ounces. (Note: 1 pound = 16
ounces.)
a) Find the probability that a randomly selected infant will
weight less than 5 pounds.
b) What percent of babies weigh between 8 and 10 pounds at
birth?
c) How much would a baby have to weigh at birth in order for
him to weight in the top
10% of all infants?
d)...

The standard deviation of the weights of elephants is known to
be approximately 15 pounds. We wish to construct a 95% confidence
interval for the mean weight of newborn elephant calves. Fifty
newborn elephants are weighed. The sample mean is 244 pounds. The
sample standard deviation is 11 pounds.
Construct a 95% confidence interval for the population mean weight
of newborn elephants. State the confidence interval. (Round your
answers to two decimal places.)
,
Sketch the graph. (Round your answers...

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