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Intro to Standard Deviation

Authored by Anthony Clark

Mathematics

12th Grade

Intro to Standard Deviation
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15 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The z-score represents.....

the amount of standard deviations a data value is above or below the mean.

the percentile the data value is above or below the mean.

the amount of standard deviations a data value is above or below the median.

the percent the data value is above or below the mean.

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

Find the area of the shaded region. 

0.16

0.84

0.68

0.34

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

What's the probability of the gray area? (Mean = 55, Standard dev = 2.5)

0.8185

0.8413

0.8641

0.8389

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The mean life of a tire is 30,000 km. The standard deviation is 2000 km.

Then, 68% of all tires will have a life between ___________ km and __________ km.

 28,000 km and 32,000 km.

24,000 km and 34,000 km.

26,000 km and 34,000 km.

27,000 km and 31,000 km.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.

About what percent of the products last between 12 and 15 days?

68%

34%

16%

2.5%

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Between what two standard deviations of a normal distribution contain 68% of the data?

one below and one above

two below and two above

two below and zero

zero and two above

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The mean GPA of students in a course at UCDavis is 3.2 with a standard deviation of 0.3. What percent of students in the course have a GPA between  2.9 and 3.8?

81.5%

47.5%

68%

95%

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