Question

Birth weights in the USA are normally distributed with mean of 3420 g and standard deviation of 495g. Find the probability that a randomly selected baby weight is between 2450g and 4390g.

Answer #1

Given

The probability that a randomly selected baby weight is between 2450g and 4390g is 0.95

4. Suppose the birth weights of babies in the USA are normally
distributed, with mean 7.47 lb and standard deviation 1.21 lb. a.
Find the probability that a randomly chosen baby weighed between
6.4 and 8.1 pounds. (Show work.) b. Suppose a hospital wants to try
a new intervention for the smallest 4% of babies (those with the
lowest birth weights). What birth weight in pounds is the largest
that would qualify for this group? (Show your work.)

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)...

Birth weights in the United States have a distribution that is
approximately normal with a mean of 3396 g and a standard deviation
of 576 g. Apply Table A-2 or statistics technology you can use to
answer the following questions:
(a) One definition of a premature baby is the the birth weight
is below 2500 g. If a baby is randomly selected, find the
probability of a birth weight below 2500 g.
(b) Another definition of a premature baby is...

Birth weights in the United States have a distribution that is
approximately normal with a mean of 3396 g and a standard deviation
of 576 g. Apply Table A-2 or statistics technology you can use to
answer the following questions:
(a) One definition of a premature baby is the the birth weight
is below 2500 g. If a baby is randomly selected, find the
probability of a birth weight below 2500 g.
(b) Another definition of a premature baby is...

The weights of steers in a herd are distributed normally. The
standard deviation is 200lbs and the mean steer weight is 1300lbs.
Find the probability that the weight of a randomly selected steer
is between 1000 and 1437lbs. Round your answer to four decimal
places.

The birth weight of newborn babies is normally distributed with
a mean of 7.5 lbs and a standard deviation of 1.2 lbs.
a. Find the probability that a randomly selected newborn baby
weighs between 5.9 and 8.1 pounds. Round your answer to 4 decimal
places.
b. How much would a newborn baby have to weigh to be in the top
6% for birth weight? Round your answer to 1 decimal place.

Weights of men are normally distributed with a mean of 189 lb
and a standard deviation of 39 lb. If 20 men are randomly selected,
find the probability that they have weights with a mean between 200
lb and 230 lb.

The weights of steers in a herd are distributed normally. The
standard deviation is 200 lbs and the mean steer weight is 1000
lbs. Find the probability that the weight of a randomly selected
steer is between 1160 and 1260 lbs. Round your answer to four
decimal places.

The weights of steers in a herd are distributed normally. The
standard deviation is 200lbs and the mean steer weight is 1200lbs.
Find the probability that the weight of a randomly selected steer
is greater than 1479lbs. Round your answer to four decimal
places.

The weights of steers in a herd are distributed normally. The
standard deviation is 200lbs200lbs and the mean steer weight is
900lbs900lbs. Find the probability that the weight of a randomly
selected steer is greater than 579lbs579lbs. Round your answer to
four decimal places.

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