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WorksheetsExtra work Trig.& Elem. Functions
Total questions: 15
Worksheet time: 18mins
What is the range?
The sum of the largest and smallest number
The number in the middle
The difference between the largest and smallest number
The number that appears most often
Dr. Dre is a dentist. He needs to report on the average (Mean) number of cavities that his patients have.
1, 0, 1, 5, 0, 3, 4. What is the average number of cavities?
14
2
7
1
12, 10, 10, 10, 13, 12, 11, 13, 10
What does variance represent?
How many different variations are in the data set.
How the population varies compared to the sample.
How spread out each data value is from the mean.
The range, but with a bunch of other stuff going on.
Before you can begin calculating the variance, you must first:
find the mean
find the median
find the mode
find the range
What is the difference between the formulas for population variance and sample variance?
The sample variance is the square root of the population variance.
The population variance divides the sum of the squares by n-1, while sample divides by N.
The population variance divides the sum of the squares by N, while sample divides by n-1.
There is no difference.
How do you calculate the standard deviation?
Divide the variance by 2.
Its a long process and I can't explain it right now.
Find the mean and multiply it by the variance.
Take the square root of the variance.
Calculate the mean.
μ = 10
μ = 10.5
x̄ = 10.5
μ = 11
Last step... What is the variance?
24.25
29.1
2
4.9
