Question

Pediatricians have been able to determine that the distribution of birth weights for boys is approximately normal with mean 3494 grams and standard deviation 603 grams. They have also determined that the distribution of birth weights for girls is approximately normal with mean 3266 grams and standard deviation 570 grams.

1. There is another baby named Brittney who has a birth weight of 3137 grams. Who has a relatively higher birthweight: Brittney or Brock. Show all work and calculations. (Hint: use Z-scores)

2. Find the first quartile for female birthweights. Round your answer to 1 decimal place.

3. Find the third quartile for female birthweights. Round your answer to 1 decimal place.

brocks birth weight was 3232 grams

Answer #1

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...

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...

In a certain country, the mean birth weight for boys is 3.28kg,
with a standard deviation of 0.57kg. Assuming that the distribution
of birth weight is approximately normal, complete parts a through
e below.
a. A baby is considered of low birth weight if it weighs less
than 2.5 kg. What proportion of baby boys in this country are born
with low birth weight? The proportion of baby boys that are born
with a low birth weight is ?
b....

The weights of newborn baby boys born at a local hospital are
believed to have a normal distribution with a mean weight of 3951
grams and a variance of 60,025 . If a newborn baby boy born at the
local hospital is randomly selected, find the probability that the
weight will be between 3485 and 4147 grams. Round your answer to
four decimal places.

In a certain country, the mean birth weight for boys 3.23 kg,
with a standard deviation of 0.58 kg. Assuming that the
distribution of birth weight is approximately normal, complete
parts a through e below.a. A baby is considered of low birth weight
if it weighs less than 2.5 kg.
a. What proportion of baby boys in this country are born with
low birth weight?
b. What is the z-score for a baby boy that weighs 1.5 kg
(defined as...

low-birth-weight babies - Researchers in Norway an-
alyzed data on the birth weights of 400,000 newborns
over a 6-year period. The distribution of birth weights
is Normal with a mean of 3668 grams and a standard
deviation of 511 grams.Babies that weigh less than
2500 grams at birth are classified as “low birth weight.”
(a) What percent of babies will be identified as low birth
weight?
(b) Find the quartiles of the birth weight distribution.

4.39 Weights of pennies: The distribution of weights of United
States pennies is approximately normal with a mean of 2.5 grams and
a standard deviation of 0.03 grams. Use Normalcdf as needed. (a)
What is the probability that a randomly chosen penny weighs less
than 2.4 grams? 0.0004 Correct (please round to four decimal
places) (b) Describe the sampling distribution of the mean weight
of 10 randomly chosen pennies. Mean: 2.5 Correct grams (please
round to one decimal place) Standard...

A study studied the birth weights of 2,032 babies born in the
United States. The mean weight was 3234 grams with a standard
deviation of 871 grams. Assume that birth weight data are
approximately bell-shaped. Estimate the number of newborns who
weighed between 1492 grams and 4976 grams. Write only a number as
your answer. Round your answer to the nearest whole number.

A study studied the birth weights of 1,214 babies born in the
United States. The mean weight was 3234 grams with a standard
deviation of 871 grams. Assume that birth weight data are
approximately bell-shaped. Estimate the number of newborns who
weighed between 1492 grams and 4976 grams.
Write only a number as your answer. Round your answer to the
nearest whole number.

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