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WorksheetsMeasures of Center and Spread
Total questions: 16
Worksheet time: 2hrs 30mins
{12, 13, 29, 18, 61, 35, 21}
If the data set is approximately normal, what percent of people are within 1 standard deviation of the mean?
99.7
34
68
95
If Gonzalo's score is 87, the class average is 82, and the SD is 4, how many standard deviations is he above the mean?
-1.25
+1.25
+1.20
+1.02
If waist sizes are normally distributed, determine the z-score of a teenage male with a 33 inch waist.
The mean score in an accounting test is 80 with a standard deviation of 10. Between which two scores must the mean lie to represent at least 89% of the data set?
70 - 90
60 - 100
50 - 110
40 - 120
The mean age of a dinosaur fossil in a particular fossil bed is 85 million years. The standard deviation of the fossil ages from this bed is 2.5 million years. At least __________ of fossils in this bed are between 80 and 90 million years old.
75 %
89 %
2%
70%
2, 5, 12, 15, 19, 4, 6, 11, 16, 18, 12, 12, 42
What effect does removing the outlier have on the distribution of the data?
$7.75, $8.50, $7.25, $9.00, $30.00, $8.25, $7.75, $9.00
Which statement is true?
The distribution of data is skewed right. What is the relationship between the mean and median?
median > mean
mean > median
mean = median
Impossible to tell.
Which of the following is NOT affected by outliers?
mean
standard deviation
IQR
range
