Question

The times per week a student uses a lab computer are normally distributed, with a mean of 6.2 hours and a standard deviation of 1.3 hours. A student is randomly selected. Find the following probabilities.

(a) Find the probability that the student uses a lab computer less than 4 hours per week.

(b) Find the probability that the student uses a lab computer between 6 and 8 hours per week.

(c) Find the probability that the student uses a lab computer more than 9 hours per week.

(Round answers to three decimal places as needed.)

Answer #1

The times per week a student uses a lab computer are normally
distributed, with a mean of 6.1 hours and a standard deviation of
1.3 hours. A student is randomly selected. Find the following
probabilities.
(a) Find the probability that the student uses a lab computer
less than 4 hours per week.
(b) Find the probability that the student uses a lab computer
between 7 and 8 hours per week.
(c) Find the probability that the student uses a lab...

The times per week a student uses a lab computer are normally
distributed, with a mean of 6.3 hours and a standard deviation of
1.2 hours. A student is randomly selected. Find the following
probabilities.
(a) Find the probability that the student uses a lab computer
less than 5 hours per week.
(b) Find the probability that the student uses a lab computer
between 6 and 8 hours per week.
(c) Find the probability that the student uses a lab...

the amount of money that students spend on their cell phones per
week in normally distributed with a mean of 52.00 and standard
deviation of 6.00. 1.2.1 What is the probability that a student
studies for more that 60.00 per week? 1.2.2 find the probability
that the mean amount of money on cell phones for three randomly
selected students is less than 60.66 per week.

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 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.)...

The time a student spends learning a computer software package
is normally distributed with a mean of 8 hours and a standard
deviation of 1.5 hours. A student is selected at random.
a)What is the probability that the student spends at least 6
hours learning the software package?
b) What is the probability that the student spends between 6.5
and 8.5 hours learning the software package?
c) If only 7% of the students spend more than k hours learning
the...

Replacement times for TV sets are normally distributed with mean
of 8.2 years and a standard deviation of 1.1 years.
Find the probability that a randomly selected TV will have a
replacement time less than 5.0 years.(5%)
Find the probability that a randomly selected TV will have a
replacement time between 7 and 9 years? (5%)
If you want to provide a warranty so that only 1% of the TV
sets will be replaced before warranty expires, what is the...

The times that a person spends in the shower are normally
distributed with a mean of 12.5 minutes and a standard deviation of
3.5 minutes. If 25 people is selected, find the probability that
the mean time taken by him/her is less than 14 minutes?

The times that a person spends in the shower are normally
distributed with a mean of 12.5 minutes and a standard deviation of
3.5 minutes. If 9 people is selected, find the probability that the
mean time taken by him/her is greater than 15.2 minutes?

The mean of a normally distributed data set is 112, and the
standard deviation is 18.
a) Use the Empirical Rule to find the probability
that a randomly-selected data value is greater than 130.
b) Use the Empirical Rule to find the probability
that a randomly-selected data value is greater than 148.
A psychologist wants to estimate the proportion of people in a
population with IQ scores between 85 and 130. The IQ scores of this
population are normally distributed...

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