Question

The monthly utility bills in a city are normally distributed, with a mean of $100 and a standard deviation of $16. Find the probability that a randomly selected utility bill is (a) less than $67, (b) between $80 and $100, and (c) more than $110.

(a) The probability that a randomly selected utility bill is less than $67 is nothing. (Round to four decimal places as needed.)

(b) The probability that a randomly selected utility bill is between $80 and $100 is nothing. (Round to four decimal places as needed.)

(c) The probability that a randomly selected utility bill is more than $110 is nothing. (Round to four decimal places as needed.)

Answer #1

The monthly untily bills in a city are normally distributed
with a mean of $100 with standard deviation of $15. find the
probability that a randomly selected utility bill is less than $65?
between $80 and $90? and more than $100?

The amounts of time per workout an athlete uses a stairclimber
are normally distributed, with a mean of
2424
minutes and a standard deviation of
66
minutes. Find the probability that a randomly selected athlete
uses a stairclimber for (a) less than
2121
minutes, (b) between
2424
and
3333
minutes, and (c) more than
4040
minutes.
(a) The probability that a randomly selected athlete uses a
stairclimber for less than
2121
minutes is
nothing.
(Round to four decimal places as...

The lengths of a particular animal's pregnancies are
approximately normally distributed, with mean muequals276 days and
standard deviation sigmaequals16 days. (a) What proportion of
pregnancies lasts more than 300 days? (b) What proportion of
pregnancies lasts between 268 and 288 days? (c) What is the
probability that a randomly selected pregnancy lasts no more than
248 days? (d) A "very preterm" baby is one whose gestation
period is less than 240 days. Are very preterm babies unusual?
The proportion of...

Assume that women's heights are normally distributed with a
mean given by mu equals 62.5 in, and a standard deviation given by
sigma equals 1.9 in. (a) If 1 woman is randomly selected, find
the probability that her height is less than 63 in. (b) If 32
women are randomly selected, find the probability that they have a
mean height less than 63 in. (a) The probability is approximately
nothing. (Round to four decimal places as needed.) (b) The
probability...

Assume that women's heights are normally distributed with a
mean given by mu equals 63.6 in, and a standard deviation given by
sigma equals 2.4 in. (a) If 1 woman is randomly selected, find
the probability that her height is less than 64 in. (b) If 39
women are randomly selected, find the probability that they have a
mean height less than 64 in. (a) The probability is approximately
nothing. (Round to four decimal places as needed.) (b) The
probability...

The lengths of a particular animal's pregnancies are
approximately normally distributed, with mean
muμequals=265265
days and standard deviation
sigmaσequals=1616
days.(a) What proportion of pregnancies lasts more than
285285
days?(b) What proportion of pregnancies lasts between
253253
and
273273
days?(c) What is the probability that a randomly selected
pregnancy lasts no more than
237237
days?(d) A "very preterm" baby is one whose gestation period
is less than
229229
days. Are very preterm babies unusual?
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Electricity bills in a certain city have mean $87.57. Assume the
bills are normally distributed with standard deviation $14.97. A
sample of 80 bills was selected for an adult. Find the 53
percentile for the sample mean. Write only a number as your answer.
Round to two decimal places (for example: 42.81). Do not write any
units.

The amounts of time per workout an athlete uses a stairclimber
are normally distributed, with a mean of
22 minutes and a standard deviation of 7 minutes. Find the
probability that a randomly selected athlete uses a stairclimber
for (a) less than 17 minutes, (b) between 22 and 31
minutes, and (c) more than 30 minutes.
(a) The probability that a randomly selected athlete uses a
stairclimber for less than 17 minutes is =
(Round to four decimal places as needed.)...

In a recent year, the scores for the reading portion of a test
were normally distributed, with a mean of
22.7
and a standard deviation of
6.3.
Complete parts (a) through (d) below.
(a) Find the probability that a randomly selected high school
student who took the reading portion of the test has a score that
is less than
16.
The probability of a student scoring less than
16
is
nothing.
(Round to four decimal places as needed.)
(b) Find...

17 (CO 3) A survey indicates that shoppers spend an average of
22 minutes with a standard deviation of 16 minutes in your store
and that these times are normally distributed. Find the probability
that a randomly selected shopper will spend less than 20 minutes in
the store
18(CO 3) The monthly utility bills in a city are normally
distributed with a mean of $121 and a standard deviation of $23.
Find the probability that a randomly selected utility bill...

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