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20 questions
What is the the total probability under the normal distribution curve?
10%
25%
.5%
100%
Between what two standard deviations of a normal distribution lies 68% of the data?
one below and one above
two below and two above
two below and zero
zero and two above
Between what two standard deviations of a normal distribution lies 95% of the data?
one below and one above
two below and two above
two below and zero
zero and two above
This data is normally distributed. What percent of the data is in the shaded region?
68%
95%
99.8%
50%
This data is normally distributed. What percent of the data is in the shaded region?
68%
95%
99.8%
50%
This data is normally distributed. What percent of the data is in the shaded region?
68%
95%
99.8%
50%
This data is normally distributed. What percent of the data is in the shaded region?
68%
32%
16%
50%
This data is normally distributed. What percent of the data is in the shaded regions?
5%
95%
2.5%
50%
This data is normally distributed. What percent of the data is in the shaded region?
99.8%
0.2%
0.15%
50%
A grading scale is set up for 1000 students’ test scores. It is assumed that the scores are normally distributed with a mean score of 75 and a standard deviation of 15. Calculate the score that lies 2 standard deviation below the mean.
60
475
45
9500
In an Oreo factory, the mean mass of a cookie is given as 40 g. For quality control, the standard deviation is 2 g. If 10 000 cookies were produced, how many cookies are within 2 g of the mean?
6800
9500
3200
9750
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%
99.7%
95%
34%
The speeds of cars on the highway have a mean of 95 km/h with a standard deviation of 5 km/h. What percentage of cars averaged less than 85 km/h?
.15%
2.35%
2.5%
18.5%
The mean life of a tire is 30 000 km. The standard deviation is 2000 km. 68% of all tires will have a life between ______km and ______km.
26000 and 34000
28000 and 32000
24000 and 34000
22000 and 36000
Which set of exam data better represents a normal distribution?
Exam 2
Exam 1
Neither
Both
Which distribution has the smallest standard deviation?
red
yellow
green
blue
they are all the same
Which distributions have the same mean? Check all that apply.
red
yellow
green
blue
none of them have the same mean
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