Chapter 7: Q.26 (page 429)
True or False: only the sums of normal distributions are also normal distributions.
The given statement is false.
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
A manufacturer produces -pound lifting weights. The lowest actual weight is pounds, and the highest is pounds. Each weight is equally likely so the distribution of weights is uniform. A sample of weights is taken.
Find the percentile for the mean weight for the weights.
A uniform distribution has a minimum of six and a maximum of ten. A sample of is taken.
Find .
82. Would you be surprised, based upon numerical calculations, if the sample average wait time (in minutes) for 100 riders was less than 30 minutes?
a. yes
b. no
c. There is not enough information.
Based on data from the National Health Survey, women between the ages of and have an average systolic blood pressures (in mm Hg) of with a standard deviation of Systolic blood pressure for women between the ages of to follow a normal distribution.
a. If one woman from this population is randomly selected, find the probability that her systolic blood pressure is greater than .
b. If women from this population are randomly selected, find the probability that their mean systolic blood pressure is greater than .
c. If the sample were four women between the ages of to and we did not know the original distribution, could the central limit theorem be used?
The length of time a particular smartphone's battery lasts follows an exponential distribution with a mean of ten months. A sample of 64 of these smartphones is taken.
What is the distribution for the total length of time 64 batteries last?
What do you think about this solution?
We value your feedback to improve our textbook solutions.
