Question

According to one study among a certain group, pregnancy lengths are approximately normally distributed with a mean of 267 days and a standard deviation of 7 days. Approximately 12.7% of babies are premature, which means that they are born before 37 weeks in the pregnancy. A random sample of 75 pregnant women from this group is observed and the length of each pregnancy is recorded. Let X be the number of premature babies born to these mothers. What is the probability that more than 10 premature babies are born to these mothers? (do not round the answer)

Answer #1

The lengths of pregnancies are normally distributed with a mean
of 267 days and a standard deviation of 15 days. a. Find the
probability of a pregnancy lasting 309days or longer. b. If the
length of pregnancy is in the lowest 33%, then the baby is
premature. Find the length that separates premature babies from
those who are not premature.
The probability that a pregnancy will last
309 days or longer is nothing

The lengths of pregnancies are normally distributed with a mean
of 268 days and a standard deviation of 15 days. a. Find the
probability of a pregnancy lasting 308 days or longer. b. If the
length of pregnancy is in the lowest 3%, then the baby is
premature. Find the length that separates premature babies from
those who are not premature.
a. The probability that a pregnancy will last 308 days or longer
is ?
b. Babies who are born...

The lengths of pregnancies are normally distributed with a mean
of 266 days and a standard deviation of 15 days. a. Find the
probability of a pregnancy lasting 307 days or longer. b. If the
length of pregnancy is in the lowest 44%,then the baby is
premature. Find the length that separates premature babies from
those who are not premature.
a. The probability that a pregnancy will last 307 days or longer
is [ ]. (Round to four decimal places)...

he lengths of pregnancies are normally distributed with a mean
of
267
days and a standard deviation of
1515
days. a. Find the probability of a pregnancy lasting
309309
days or longer. b. If the length of pregnancy is in the
lowest
3 percent
then the baby is premature. Find the length that separates
premature babies from those who are not premature.Click to view
page 1 of the table.
LOADING...
Click to view page 2 of the table.
LOADING...
a....

The lengths of pregnancies are normally distributed with a mean
of 266 days and a standard deviation of 15 days. a. Find the
probability of a pregnancy lasting 309 days or longer. b. If the
length of pregnancy is in the lowest 4 %, then the baby is
premature. Find the length that separates premature babies from
those who are not premature.

The lengths of pregnancies are normally distributed with a mean
of 266 days and a standard deviation of 15 days. a) Find the
probability of a pregnancy lasting 307 days or longer. b) If the
length of pregnancy is in the lowest 44%, then the baby is
premature. Find the length that separates premature babies from
those who are not premature.

The lengths of pregnancies are normally distributed with a mean
of
267267
days and a standard deviation of
1515
days. a. Find the probability of a pregnancy lasting
308308
days or longer. b. If the length of pregnancy is in the
lowest
22%,
then the baby is premature. Find the length that separates
premature babies from those who are not premature.Click to view
page 1 of the table.
LOADING...
Click to view page 2 of the table.
LOADING...
a. The...

Suppose the lengths of the pregnancies of a certain animal are
approximately normally distributed with mean μ=162 days and
standard deviation σ=10 days.
Complete parts (a) through (f) below.
(a) What is the probability that a randomly selected pregnancy
lasts less than
159 days?The probability that a randomly selected pregnancy
lasts less than 159 days is approximately .3821
(Round to the nearest integer as needed.)
A.If 100 pregnant individuals were selected independently from
this population, we would expect ___pregnancies to...

The lengths of pregnancies are normally distributed with a mean
of
270270
days and a standard deviation of
1515
days. a. Find the probability of a pregnancy lasting
309309
days or longer. b. If the length of pregnancy is in the
lowest
33%,
then the baby is premature. Find the length that separates
premature babies from those who are not premature.Click to view
page 1 of the table.
LOADING...
Click to view page 2 of the table.
LOADING...
a. The...

The lengths of a particular animal's pregnancies are
approximately normally distributed, with μ=261and standard
deviation= 88.
What proportion of pregnancies lasts between 251 and 267
days?
What is the probability that a randomly selected pregnancy lasts
no more than 245 days?
A "very preterm" baby is one whose gestation period is less
than 243 days. Are very preterm babies unusual?

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