WorksheetsQuizizz 6.3 (Ch. 3, Sections 1-2)
Total questions: 13
Worksheet time: 1hrs 22mins
Name
Class
Date
1.
What shape is a normal distribution curve?
a)
Half curve
b)
Round curve
c)
Bell curve
d)
Square curve
2.
What is the the total area under the standard normal distribution curve?
a)
100
b)
25
c)
.5
d)
1
3.
According to the empirical rule, what percentage of data falls within 1 standard deviation?
a)
25%
b)
68%
c)
95%
d)
99.7%
4.
According to the empirical rule, how much of the data falls within 3 standard deviations?
a)
25%
b)
68%
c)
95%
d)
99.7%
5.
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.
6.
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
7.
The average waist size for teenage males is 29 inches with a standard deviation of 1.4 inch. If waist sizes are normally distributed, estimate the proportion of teenagers who will have waist sizes greater than 31 inches?
a)
92.4%
b)
10.5%
c)
16%
d)
7.6%
8.
The scoring of modern IQ is such that Intelligence Quotients (IQs) have a normal distribution of μ= 100 and 𝞂 = 15. Mensa International is a non-profit organization that accepts only people with IQ score within the top 2%. What level of IQ qualifies one to be a member of Mensa?
a)
115
b)
130.75
c)
145
d)
120
9.
Women’s heights have a mean of 63.6 in. and a standard deviation of 2.5 inches. A woman is in the 98th percentile. How tall is the woman?
a)
58.5 in
b)
66.8 in
c)
61.5 in
d)
68.7in
10.
Suppose that 10th grade girls have hair lengths that are normally distributed with a mean of 10 inches and a standard deviation of 4 inches. How long would a 10th grade girl's hair have to be in order to be at the 80th percentile for length?
a)
13.4 inches
b)
6.6 inches
c)
4.4 inches
d)
14.7 inches
11.
The mean temperature in Glens Falls, NC for the month of February is 23 degrees with a standard deviation of 4.2 degrees. How warm would it have to be in order to be in the warmest 15% of days?
a)
26.5 degrees
b)
18.6 degrees
c)
27.4 degrees
d)
55.96 degrees
12.
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
13.
Professional golfer John Daly is known for his long drives off the tee. Suppose his drives have a mean distance of 315 yards with a standard deviation of 12 yards. What lengths of drives will constitute the middle 60% of all of his drives?
a)
303 yards to 327 yards
b)
0 to 318 yards
c)
312 yards to 318 yards
d)
305 to 325 yards
100 %
