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WorksheetsYear 12 Friday quiz 1
Total questions: 15
Worksheet time: 45mins
Name
Class
Date
1.
In a survey of men in the United States (ages 20-29), the mean height was 69.6 inches with a standard deviation of 3.0 inches. Find the minimum height in the top 22%.
a)
69.37 in
b)
67.58 in
c)
73.12 in
2.
The mean number of accidents a week at a company is 6.4 with a standard deviation of 1.5. What proportion of weeks would you expect to have less than 5 accidents?
a)
0.6915
b)
0.1762
c)
0.8238
d)
-0.93
3.
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?
a)
81.5%
b)
47.5%
c)
68%
d)
95%
4.
Between what two standard deviations of a normal distribution contain 68% of the data?
a)
one below and one above
b)
two below and two above
c)
two below and zero
d)
zero and two above
5.
What is the the total area under the standard normal distribution curve?
a)
100
b)
25
c)
.5
d)
1
6.
μ = 70 , σ = 8 , X = 50 . Find z score
a)
2.5
b)
-2.5
c)
5.2
d)
-5.2
7.
The z-score represents.....
a)
the amount of standard deviations a data value is above or below the mean.
b)
the percentile the data value is above or below the mean.
c)
the amount of standard deviations a data value is above or below the median.
d)
the percent the data value is above or below the mean.
8.
Which is NOT true about the standard normal distribution?
a)
It is bell-shaped.
b)
It is unimodal.
c)
The mean is 0 and the standard deviation is 1.
d)
It is asymmetrical.
9.
What shape is a normal distribution curve?
a)
Half curve
b)
Round curve
c)
Bell curve
d)
Square curve
10.
The width of the curve is determined by the _____________________.
a)
Mean
b)
Variation
c)
Standard Deviation
d)
Standard Normal Curve
11.
What is the formula to find the corresponding z-score for population data?
a)
z = X - μ / σ
b)
z = (X - μ) / σ
c)
z = μ - X / σ
d)
z = (μ - X) / σ
12.
Which of the following is NOT TRUE?
a)
The mean, median, and the mode are equal.
b)
The curve is asymptotic to the base line.
c)
The total area under the curve is less than 1.
d)
The curve is symmetrical about its center.
13.
Find the corresponding z-score when X = 40, μ = 30 and σ = 5.
a)
1
b)
-2
c)
2
d)
-1
14.
Find the corresponding z-score of a PE score of 39 given that μ = 45 and σ = 6.
a)
1
b)
-2
c)
2
d)
-1
15.
Find the raw score given z = -1.5, μ = 26, and σ = 4.
a)
20
b)
32
c)
28
d)
30
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