Exercises
Date: 2015-10-07; view: 434.
1. The following numbers of books were read by each of the 28 students in a literature class.
a) Find the mean
b) Find the median
c) Find the mode
d) Find the variance and standard deviation.
2. The all forty students in a class found the following figures for number of hours spent studying in the week before final exam
a) Find the mean time for study
b) Find the median
c) Find the mode
d) Find the variance and standard deviation for this population.
3. A sample of fifty personal property insurance policies found the following numbers of claims over the past 2 years
| Number of claims | 0 1 2 3 4 5 6 |
| Number of policies | 21 13 5 4 2 3 2 |
a) Find the mean number of claims per day policy
b) Find the sample median of claims
c) Find the modal number of claims for this sample
d) Find the sample variance and standard deviation.
4. For sample of 50 antique car owners, the following numbers of cars' ages was obtained
a) Find the mean age of cars
b) Find the median
c) Find the modal number
d) Find the sample variance and standard deviation.
5. The following data represents the net worth (in million of dollars) of 45 national corporations
a) Find the sample mean net worth
b) Find the median
c) Find the mode
d) Find the sample variance and standard deviation
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| Variance for data with multiple-observation values | | | Frequency distribution. Grouped data and histograms |