Standard Deviation and Variance
The variance of a data set is 9, what is the standard deviation?
Standard deviation = 3
Find the range of: 109, 123, 145, 894, 147
785
Find the mode 1, 2, 3, 4, 5, 6, 6, 6, 6, 7, 8
6
Find the outlier: 123, 124, 125, 126, 456
456
Find the range: 789, 1256, 1, 0, 567
a. 1255
b. 1256
c. 1246
d. 789
b. 1256
The standard deviation of a data set is 4, what is the variation?
Variation = 16
Find the mean: 45, 67, 89, 23, 12
47.2
Find the median: 1, 3, 5, 5, 7, 9, 10
5
A bar graph describes this data: 16 pairs of running shoes, 13 pairs of basketball shoes, 5 pairs of golf shoes, and 25 pairs of bowling shoes. Which kind of shoe is the highest bar on the graph?
Bowling shoes
100 people prefer Starbucks and 70 people prefer Dunkin. What is the mean?
a. 87
b. 86
c. 84
d. 85
d. 85
True or False: Range/4 = standard deviation
If the data is approximately normal, then the range/4 is approximately equal to the standard deviation.
Find the mean: 12, 13, 14, 15, 16, 17, 147
33.4
Find the mode : 67, 891, 819, 345, 819
819
A survey asked people about their favorite flavor of ice cream. 1146 people said chocolate, 1145 people said vanilla, 89 people said strawberry, and 1143 people said rocky road. Which flavor is the outlier?
Strawberry (89)
Find the median: 234, 109, 245, 89, 75, 134, 21, 54
a. 75
b. 109
c. 89
d. 13
c. 89
Set A: 3, 4, 5, 6, 2, 3, 4 Set B: 3, 6, 8, 9, 1, 9, 1 Which data set would have the smaller standard deviation?
Set A because the numbers are closer together
Alvin has 149 pairs of socks, Theodore has 890 pairs of socks, Simon has 123 of socks, and Jane has 147 pairs of socks. Find the range.
767
Find the mode: 45, 6889, 6889, 6889, 12
6889
Find the outlier: 768, 234, 243, 214, 241
768
Find the mode: 543, 345, 453, 354, 354, 354, 123, 123, 1
a. 123
b. 354
c. 123 and 354
c. 123 and 354
True or False: It is possible for the variance to equal the standard deviation.
True. If the variance is 1, then the standard deviation is also 1.
Find the mean: 1234, 1570, 784, 36, 9756
2676
Find the median: 8769, 6543, 789, 12, 957
957
A survey asked people about their favorite holiday. 1900 people said Christmas, 400 people said Halloween, 78900 people said Thanksgiving, and 12300 people said the 4th of July. What is the range?
What is 66,600
Each square on a graph represents a group of 5 students, and there are 7 squares filled in. How students total are there?
a. 35
b. 34
c. 7
d. 5
a. 35