Normal Distributions Area
Quiz
•
Mathematics
•
12th Grade
•
Practice Problem
•
Hard
Anthony Clark
FREE Resource
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14 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 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 (31 total days) would you expect the daily rainfall to be less than 8.5 mm?
5
6
7
10
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Given a mean of 75 and a standard deviation of 7, what percentage of scores are greater than 68?
34%
84%
95%
68%
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Find the z-score with 20% of observations falling above it.
z=-0.84
z=1.84
z=-1.84
z=0.84
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Z-score of 2.5 on an IQ test is considered a genius (mean=100, SD=16). What score makes someone a genius? Hint: SOLVE for X - there was a formula in section 5.3)
89.2
130
99.38
140
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Find the area under the normal distribution curve between
z=-1.53 and z=0.
0.437
0.563
0.500
0.063
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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?
81.5%
47.5%
68%
95%
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Where can we locate the mean in the normal curve?
to the left portion
to the right portion
at the center
on the z - axis
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