Question

The mean length of a human pregnancy is 270 days, with a standard deviation of 99 days. Use the empirical rule to determine the percentage of women whose pregnancies are between 252 and 288 days. (Assume the data set has a bell-shaped distribution.)

A. 50%

B. 68%

C. 95%

D. 99.7%

Answer #1

Corrrect answer: C) 95%

Note: There is on mistake in question Standard deviation should be = 9 (maybe misprinting, so i solved the problem with Standard deviation=9)

Explanation:

By assuming the distrbution is normally ditributed, the required probability is obtained by first converting normal distribution to standard normal distribution then the probability is obtained using the standard normal distribution table,

The required probability is,

Now the normally distributed random variable X is converted to standard normal as shown below,

The equation can be written as,

This probability is obtained using the standard normal distribution table for z = -2 and z = 2,

Hence the are 95% women are have pregnency days between 252 and 288.

The mean length of a human pregnancy is
265265
days, with a standard deviation of
1111
days. Use the empirical rule to determine the percentage of
women whose pregnancies are between
254254
and
276276
days. (Assume the data set has a bell-shaped
distribution.)

The
mean length of a human pregnancy is 266 days, with a standard
deviation of 10 days. Use the empirical rule to determine the
percentage of women whose pregnancies are between 246 and 286 days.
(Assume the data set has a bell-shaped distribution)

The length of a human pregnancy is normally distributed with a
mean of 270 days with a standard deviation of 8 days. How many days
would a pregnancy last for the shortest 15%? Round answer to 2
decimal places.

Pregnancy lengths are normally distributed with a mean of 280
days and a standard deviation of 20 days. Find the probability that
if a sample of 50 pregnancies are chosen at random that the mean
length is less than 270 days.

The average length of a human pregnancy is normally distributed,
having a mean duration until birth (μ) of 266 days and a standard
deviation (σ) of 16 days. What percentage of pregnancies will last
290 days or more?
What percentage of pregnancies births will take place 246 days
or less?

The lengths of pregnancies are normally distributed with a mean
of 270 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 22%, then the baby is
premature. Find the length that separates premature babies from
those who are not premature.

(1 point)
The length of human pregnancies from conception to birth varies
according to a distribution that is approximately Normal with mean
266 days and standard deviation 16 days.
A. Find the probability that the average pregnancy length for 7
randomly chosen women exceeds 270 days. (Use at least five decimals
of accuracy in your answer)
Probability =
B. Find the probability that the average pregnancy length for 27
randomly chosen women exceeds 270 days. (Use at least five decimals...

the
department of Maternal studies at HSP university coaims that the
length of human pregnancy is exactly 270 days. A random sample od
100 pregnancies has a mean of 280 days with a standars deviation of
15 days. Is there enough evidence to support the HSP university's
claim at alpha = 0.01?

The length of human pregnancies from conception to birth
approximately follow a normal distribution with a mean of 266 days
and a standard deviation of 16 days.
What proportion of pregnancies last between 240 and 270
days
What proportion of all pregnancies will last more than 270 days
What proportion of all pregnancies will last less than 270 days
Very premature pregnancies are defined to last less than 224
days. What proportion of
pregnancies are very premature
pregnancies?
Using the...

q1.
A manufacturer knows that their items have a normally
distributed length, with a mean of 15 inches, and standard
deviation of 3.4 inches.
If one item is chosen at random, what is the probability that it is
less than 11.5 inches long?
Submit Question
q2.
The physical plant at the main campus of a large state
university recieves daily requests to replace florecent lightbulbs.
The distribution of the number of daily requests is bell-shaped and
has a mean of...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 13 minutes ago

asked 17 minutes ago

asked 36 minutes ago

asked 42 minutes ago

asked 43 minutes ago

asked 49 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago