Question

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.

Answer #1

a)

Let X denote the weight of the newborn (in lbs).

Then

Required probability =

b)

We want find 'x' such that

Birth weight, in grams, of newborn babies are normally
distributed with a mean of 3290 grams and a standard deviation of
520 grams. Find the percentage of newborns that weigh between 3000
and 4000 grams. Consider again the birth weights of newborn babies,
where the mean weight is 3290 grams and the standard deviation is
520 grams. Find the weight, in grams, that would separate the
smallest 4% of weights of newborns from the rest.

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)...

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...

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 birth weights of human babies are normally distributed
with a mean of 120 ounces and a stdev of 16 ounces (1lb = 16
ounces).
1. What is the probability that a baby is at least 9 lbs 11
ounces? 2. What is the probability that a baby weighs less than 10
lbs (160 ounces)? 3. What weight is the 90th percentile?

Newborn baby boys weigh, on average, 7.5 pounds, with a standard
deviation of 2 pounds. A group of pediatricians want to implement
special treatments for newborn baby boys in the bottom 25% birth
weight.
Use Excel to find the weight of babies that will indicate they
need the special treatment if the pediatricians look at a sample of
100 newborns.
Round the σx¯ and x¯ to two decimal places.

14)The average weight of a newborn baby is 7.9 pounds with
standard deviation 0.7 pounds. Suppose the weight of babies is
approximately Normally distributed.
a) What percentage of babies will have a birth weight between
6.5 and 9.3 pounds? Round to 2 decimals.
b)If a newborn’s weight is in the top 5% of all babies, then
what is their weight at birth? Round to 2 decimals

The weights for newborn babies is approximately normally
distributed with a mean of 5.4 pounds and a standard deviation of
1.6 pounds.
Consider a group of 1100 newborn babies:
1. How many would you expect to weigh between 3 and 8 pounds?
2. How many would you expect to weigh less than 7 pounds?
3. How many would you expect to weigh more than 6 pounds?
4. How many would you expect to weigh between 5.4 and 9
pounds?
HINT:...

Birth weights of newborn babies follow a normal distribution
with mean of 3.39 kg and standard deviation of 0.55 kg. Use a table
of Z ‑critical values to find the probability that a newborn baby
weighs less than 2.125 kg. Give your answer as a percentage rounded
to two decimal places.
Probability:

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 12 minutes ago

asked 27 minutes ago

asked 41 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago