แผ่นงานQuiz Normal Distributions & the Empirical Rule
คำถามทั้งหมด: 10
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1.
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?
About what percent of the products last between 12 and 15 days?
a)
68%
b)
34%
c)
16%
d)
2.5%
2.
At a local high school, GPA's are normally distributed with a mean of 2.9 and standard deviation of 0.6. What percentage of students at the high school have a GPA between 2.3 and 3.5?
a)
68%
b)
99.7%
c)
95%
d)
84%
3.
Which interval shows 95% of the data given a mean of 15 and a standard deviation of 3?
a)
9 to 21
b)
12 to 18
c)
6 to 24
d)
13 to 16
4.
What is the the total area under the standard normal distribution curve?
a)
100
b)
25
c)
.5
d)
1
5.
Which of the following graphs shows a normal curve?
a)
b)
c)
d)
6.
Where can we locate the mean in the normal curve?
a)
to the left portion
b)
to the right portion
c)
at the center
d)
on the z - axis
7.
According to the empirical rule, what percentage of data falls within 1 standard deviation?
a)
25%
b)
68%
c)
95%
d)
99.7%
8.
According to the empirical rule, how much of the data falls within 3 standard deviations?
a)
25%
b)
68%
c)
95%
d)
99.7%
9.
Use the following information and the Empirical Rule to estimate the answer.
The ages of golfers are normally distributed, with a mean of 38 and a standard deviation of 4.
Find the percentage of golfers that are between 30 and 46 years old.
a)
68%
b)
94%
c)
95%
d)
99.7%
10.
A 12 oz can of soda has a mean volume of 12 oz, with a standard deviation of .25 oz. How common are cans with less than 11.5 oz of soda? Calculate the probability.
a)
2.5%
b)
.15%
c)
2.35%
d)
2.25%
แป้นคำตอบQuiz Normal Distributions & the Empirical Rule
คำถามทั้งหมด: 10
1.
b) 34%
2.
a) 68%
3.
a) 9 to 21
4.
d) 1
5.
d)
6.
c)
at the center
7.
b) 68%
8.
d) 99.7%
9.
c)
95%
10.
a) 2.5%
140 %