Normal Curve Distribution

1.

Multiple Choice

3 mins

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%

2.

Multiple Choice

3 mins

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 6 days or less?

68%

34%

16%

2.5%

3.

Multiple Choice

2 mins

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.

4.

Multiple Choice

30 sec

1 pt

1. Which best describes the shaded part of this normal distribution graph?

All data that is one or higher.

All data that is one or more standard deviations above the mean.

All data that is between 1 and 3.

All data that is above the mean.

5.

Multiple Choice

5 mins

1 pt

What shape is a normal distribution curve?

Half curve

Round curve

Bell curve

Square curve

6.

Multiple Choice

30 sec

1 pt

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

one below and one above the mean

two below and two above the mean

two below the mean and zero

zero and two above the mean

7.

Multiple Choice

30 sec

1 pt

What does the mean tell you about a data set

It tells you the number that occurs the most

It is the difference between the highest and lowest number

It tells you the average of the data set

It tells you how mad someone is at another persom

8.

Multiple Choice

1 min

1 pt

What is the Normal Range (68%) of the annual precipitation for Phoenix, if the average is 29 with a standard deviation of 3?

26-32

3-29

26-29

39-32

9.

Multiple Choice

2 mins

1 pt

What is the Normal Range (68%) of the monthly salary of teachers if the average is $4,000.00 with a standard deviation of 3,000?

1000-7000

3000-4000

1000-4000

4000-7000

10.

Multiple Choice

5 mins

1 pt

The distribution of heights of adult American men is approximately Normal with mean 69 inches and standard deviation 2.5 inches. What percent of men are between 64 and 66.5 inches tall?

50%

2.5%

13.5%

34%

11.

Multiple Choice

5 mins

1 pt

The distribution of heights of adult American men is approximately Normal with mean 69 inches and standard deviation 2.5 inches. Between what heights do the middle 95% of men fall?

66.5-71.5

64-74

61.5-76.5

65-73

12.

Multiple Choice

30 sec

1 pt

The mean July daily rainfall in Hulu Kinta is 10 mm and the standard deviation is 1.5 mm

Assume that this data is normally distributed.

How many days in July would you expect the daily rainfall to be less than 8.5 mm?

5

6

7

10

13.

Multiple Choice

30 sec

1 pt

68% of the marks in a test are between 51 and 64

Assuming this data is normally distributed, what are the mean and standard deviation?

Mean = 57

S.D. = 6.5

Mean = 57

S.D. = 7

Mean = 57.5

S.D. = 6.5

Mean = 57.5

S.D. = 13

14.

Multiple Choice

30 sec

1 pt

A company makes parts for a machine. The lengths of the parts must be within certain limits or they will be rejected.

A large number of parts were measured and the mean and standard deviation were calculated as 3.1 m and 0.005 m respectively.

Assuming this data is normally distributed and 99.7% of the parts were accepted, what are the limits?

Between 3.075 m and 3.125 m

Between 3.080 m and 3.120 m

Between 3.085 m and 3.115 m

Between 3.090 m and 3.110 m

15.

Multiple Choice

3 mins

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%

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