Find the Mean Data Population

Before you can begin calculating the variance, you must first:

• find the mean

• find the median

• find the mode

• find the range

To find the _________ you add up all the numbers and then divide by how many numbers you have.

• Mean

• Median

• Mode

• Range

What is the mean?

• happening the most

• the number in the middle

• biggest-smallest

• the average

The term "snowstorms of note" applies to all snowfalls over 6 inches. The snowfall amounts for snowstorms of note in Utica, New York, over a four-year period are as follows: 7.1, 9.2, 8.0, 6.1, 14.4, 8.5, 6.1, 6.8, 7.7, 21.5, 6.7, 9.0, 8.4, 7.0, 11.5, 14.1, 9.5, 8.6 What are the mean and SAMPLE standard deviation for these data, to the nearest hundredth?

• mean = 9.46; standard deviation = 3.74

• mean = 9.46; standard deviation = 3.85

• mean = 9.45; standard deviation = 3.74

• mean = 9.45; standard deviation = 3.85

What does μ stand for?

• Population standard deviation

• Population mean

• Sample standard deviation

• Sample mean

You sample 16 students in your school, and they average 13 hours of TV a week. Assume the standard deviation is 3. Find a 99% Confidence Interval.

• 99% confident the population mean is between 11.77 and 14. 23

• 99% confident the population mean is between 11.53 and 14.47

• 99% confident the sample mean is between 11.06 and 14.96

• 99% confident the population mean is between 11.06 and 14.96

Find the mean of these numbers:
2, 57, 38, 42, 6

• 29

• 38

• 50

• 145

Which measure of central tendency would best represent this data?

• Mean

• Median

• Mode

• Range

If test scores for a class are: 100, 100, 90, 90, 80, 80, 70, 70, 60, and 60, what are the mean and sample standard deviation?

• mean = 80, stdev = 14.9

• mean = 70, stdev = 14.9

• mean = 80, stdev = 13.9

• mean = 80, stdev = 12.9

• mean = 85, stdev = 14.9

Calculate the mean.

• μ = 10

• μ = 10.5

• x̄ = 10.5

• μ = 11