Question
In: Statistics and Probability
The amounts of time per workout an athlete uses a stairclimber are normally distributed, with a...
The amounts of time per workout an athlete uses a stairclimber are normally distributed, with a mean of 24 minutes and a standard deviation of 5 minutes. Find the probability that a randomly selected athlete uses a stairclimber for (a) less than 20 minutes, (b) between 24 and 32 minutes, and (c) more than 40 minutes
Solutions
orchestra answered 1 year agoRelated Solutions
The amounts of time per workout an athlete uses a stair climber are normally distributed, with...
The amounts of time per workout an athlete uses a stair climber
are normally distributed, with a mean of 21 minutes and a standard
deviation of 5 minutes. Find the probability that a randomly
selected athlete uses a stair climber for
(a) less than 17 minutes,
(b) between 21 and 28 minutes, and
(c) more than 30 minutes.
The times per week a student uses a lab computer are normally distributed, with a mean...
The times per week a student uses a lab computer are normally
distributed, with a mean of 6.5 hours and a standard deviation of
1.5 hours. A student is randomly selected. Find the following
probabilities.
(a) Find the probability that the student uses a lab computer
less than 3 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...
A) The amounts of nicotine in a certain brand of cigarette are normally distributed with a...
A)
The amounts of nicotine in a certain brand of cigarette are
normally distributed with a mean of 0.941 g and a standard
deviation of 0.319 g. The company that produces these cigarettes
claims that it has now reduced the amount of nicotine. The
supporting evidence consists of a sample of 30 cigarettes with a
mean nicotine amount of 0.848 g.
Assuming that the given mean and standard deviation have
NOT changed, find the probability of randomly selecting 30
cigarettes...
Time spent using email per session is normally distributed with a mean of 20 minutes and...
Time spent using email per session is normally distributed with
a mean of 20 minutes and a standard deviation of 3 minutes.
(a) What is the probability that time spent using email per
session is greater than 21 minutes?
(b) What is the probability that time spent using email per
session is between 18.3 minutes and 22.6 minutes?
(c) What is the probability that a random sample of 64 email
users will spend an average time greater than 21 minutes?...
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean...
The amounts of nicotine in a certain brand of cigarette are
normally distributed with a mean of 0.883 g and a standard
deviation of 0.293 g. The company that produces these cigarettes
claims that it has now reduced the amount of nicotine. In what
range would you expect to find the middle 95% of amounts of
nicotine in these cigarettes (assuming the mean has not changed)?
Between and . If you were to draw samples of size 30 from this...
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean...
The amounts of nicotine in a certain brand of cigarette are
normally distributed with a mean of 0.902 g and a standard
deviation of 0.287 g. The company that produces these cigarettes
claims that it has now reduced the amount of nicotine. The
supporting evidence consists of a sample of 33 cigarettes with a
mean nicotine amount of 0.832 g.
Assuming that the given mean and standard deviation have
NOT changed, find the probability of randomly seleting 33
cigarettes with...
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean...
The amounts of nicotine in a certain brand of cigarette are
normally distributed with a mean of 0.946 g and a standard
deviation of 0.326 g. The company that produces these cigarettes
claims that it has now reduced the amount of nicotine.
In what range would you expect to find the middle 98% of amounts of
nicotine in these cigarettes (assuming the mean has not
changed)?
Between and .
If you were to draw samples of size 46 from this population,...
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean...
The amounts of nicotine in a certain brand of cigarette are
normally distributed with a mean of 0.911 g and a standard
deviation of 0.297 g. The company that produces these cigarettes
claims that it has now reduced the amount of nicotine.
In what range would you expect to find the middle 50% of amounts of
nicotine in these cigarettes (assuming the mean has not
changed)?
Between ____ and ____.
If you were to draw samples of size 54 from...
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean...
The amounts of nicotine in a certain brand of cigarette are
normally distributed with a mean of 0.893 g and a standard
deviation of 0.306 g. The company that produces these cigarettes
claims that it has now reduced the amount of nicotine. The
supporting evidence consists of a sample of 44 cigarettes with a
mean nicotine amount of 0.819 g.
Assuming that the given mean and standard deviation have
NOT changed, find the probability of randomly selecting 44
cigarettes with...
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean...
The amounts of nicotine in a certain brand of cigarette are
normally distributed with a mean of 0.962 g and a standard
deviation of 0.313 g. The company that produces these cigarettes
claims that it has now reduced the amount of nicotine. The
supporting evidence consists of a sample of 48 cigarettes with a
mean nicotine amount of 0.899 g.
Assuming that the given mean and standard deviation have
NOT changed, find the probability of randomly seleting 48
cigarettes with...
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