
Statistics Review Normal Distribution
Authored by Anthony Clark
Mathematics
12th Grade
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14 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
This data is normally distributed. What percent of the data is in the shaded region?
68%
95%
99.7%
50%
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What percent of people within 1 standard deviation of the mean?
99.7
34
68
95
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Identify the mean and standard deviation for this normal distribution.
The mean is 100 and the standard deviation is 15.
The mean is 100 and the standard deviation is 30.
The mean is 15 and the standard deviation is 100.
The mean is 30 and the standard deviation is 100.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A real estate agent, working entirely on commission, makes a weekly average of $850 with a standard deviation of $260 selling property in the city, and an average of $1340 with a standard deviation of $390 selling property in the suburbs. Assuming independence, what are the mean and standard deviation of her total weekly sales?
μX = 1095, σX = 325
μX = 1095, σX = 469
μX = 2190, σX = 325
μX = 2190, σX = 469
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of these variables is least likely to have a normal distribution?
Ages of 2000 students at a local high school.
Weights of 200 of the same candy bar in a shipment to a local supermarket.
Heights of 100 white pine trees in a forest.
Amount of soda in 60 cups filled by an automated machine at a fast-food restaurant.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The grades on a quiz in statistics had an average of 73 with a standard deviation of 5. The teacher decided to curve the quiz grades using the equation: curve = 1.3(grade) - 10. What are the mean and standard deviation of the curved grades?
μ = 94.9, σ = 6.5
μ = 84.9, σ = 6.5
μ = 84.9, σ = -3.5
μ = 84.9, σ = 5
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The 35th percentile of a population is the number x such that:
35% of the population scores are above x.
65% of the population scores are above x.
x is 65% of the population mean.
x is 35% of the population mean.
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