Question

The length of human pregnancies from conception to birth varies according to a distribution that can be modeled by a normal random variable with mean 265 days and standard deviation 15days.

**Question 1.** What percent of pregnancies last
less than 240 days? **Note** that the
answer is requested as a percent. Use 2 decimal places in your
answer.

ANSWER: 4.78%

**Question 2.** What percent of pregnancies last
between 240 and 270 days? **Note** that the answer is
requested as a percent. Use 2 decimal places in your answer.

ANSWER: 58.28%

**Question 3.** The longest 20% of pregnancies last
at least how many days? (round to the nearest whole day)

days.

Answer #1

*NOTE
:**Here Z Values are rounded to
' 2' decimals.*

*if, Z values do not round final answers will be (a)
4.78 % (b) 58.28*

The length of human pregnancies from conception to birth varies
according to a distribution that can be modeled by a normal random
variable with mean 269 days and standard deviation 17 days.
A) What percent of pregnancies last between 240
and 270 days? Note that the answer is requested as
a percent. Use 2 decimal places in your answer.
B) The longest 20% of pregnancies last at least how many days?
(round to the nearest whole day)
days.

The length of human pregnancies from conception to birth varies
according to a distribution that is approximately Normal with mean
261 days and standard deviation 12 days. Use a normal z-table to
answer all questions below. If not,your answers may be marked as
incorrect due to rounding issues.
(a) What proportion of pregnancies last less than 270 days
(about 9 months)? (Use 4 decimal places)
(b) What proportion of pregnancies last between 240 and 270 days
(roughly between 8 months...

The length of the human pregnancies from conception to birth
varies according to an approximately normal distribution with mean
266 days and standard deviation 16 days. (a) What percentage of
pregnancies last less than 270 days? (b) What percentage of
pregnancies last longer than 282 days? (c) What percentage of
pregnancies last between 240 to 270 days? (d) How long do the
longest 20% of pregnancies last?

Question 1: The length of human pregnancies from conception to
birth varies according to a distribution that is approximately
Normal with a mean of 266 days and standard deviation of 16
days.
What percent of pregnancies last less than 240 days?
What percent of pregnancies last between 240 days and 270
days?
How long do the longest 20% of pregnancies last?
Question 2: A federal report finds that a lie detector test
given to truthful persons have a probability of...

(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 length of human pregnancies from conception to birth varies
according to a distribution that is approximately Normal with a
mean of 266 days and a standard deviation of 16 days.
a) What is the median pregnancy length?
b) What is the interquartile range for this distribution?

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...

The length of human pregnancies from conception to birth a
very‘s according to a distribution that is approximately normal
with mean 266 days in standard deviation 16 days a study in rolls a
random sample of 36 pregnant women what is the probability that the
average pregnancy exceeds 272 days

1. The length of human pregnancies varies according to a
distribution that is approximately normal with mean 266 days and
standard deviation 16 days.
a) Sketch a normal curve on which the mean and standard
deviation are correctly located. (It is easiest to draw the curve
first, locate the inflection points, then mark the horizontal
axis.)
b) How long are the longest 2.5% of pregnancies?
c) What percentage of human pregnancies are longer than 266
days?
d) What percentage of...

Among women who give birth at home, the length of their
pregnancies have an approximately normal distribution with a mean
of 270 days and a standard deviation of 5 days. Use this
information to answer the following:
a.) Approximately what percentage of homebirth pregnancies last
between 260 and 280 days?
b.)Approximately what percentage of homebirth pregnancies last
between 255 and 270 days?
c.) Approximately what percentage of homebirth pregnancies last
less than 265 days?

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