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MAT 155 Chapter 6
The following is a brief review of Chapter 6. This
does NOT cover all the material in that
chapter.
Click on Slide Show and View Slide Show.
Read and note your answer to the question.
Advance the slide to see the answer.
Thanks to Ms. Valerie Melvin for her portion of this review.
Dr. Claude Moore, Math Instructor, CFCC
Assume that the weight loss for the first six
months of a diet program varies between 6 and
12 pounds and is spread evenly over the range
of possibilities so that there is a uniform
distribution. Find the probability of losing less
than 10 pounds.
25%
1.
2.
3.
4.
25%
25%
2
3
25%
5/7
2/3
1/3
1/6
1
4
A recent survey based upon a random
sample of 420 voters predicted that the
independent candidate for the mayoral
election will get 24% of the vote but he
actually gets 27%. Can you conclude that
the survey was done incorrectly?
50%
50%
1. Yes
2. No
1
2
If Z is a standard normal variable,
find the probability that Z lies
between 0.7 and 1.98.
1.
2.
3.
4.
0.2175
- 0.2181
1.7341
0.2181
25%
1.
25%
25%
2
3.
25%
4.
The final exam in MAT 160 has a mean of 73 and
a standard deviation of 7.8. If 24 students are
randomly selected, find the probability that the
mean of their test scores is less than 70.
1.
2.
3.
4.
0.1006
0.0298
0.0301
0.8966
25%
1.
25%
25%
2.
3.
25%
4.
Assume that thermometer readings are
normally distributed with a mean of 0 degrees
Celsius and a standard deviation of 1.00
degrees. A thermometer is randomly selected
and tested. Find the probability that the reading
is less than – 2.75.
1.
2.
3.
4.
0.003
0
0.050
0.009
25%
1.
25%
25%
2
3.
25%
4.
Assume that thermometer readings are
normally distributed with a mean of 0 degrees
Celsius and a standard deviation of 1.00
degrees. A thermometer is randomly selected
and tested. Find the probability that the reading
is between 1.00 and 3.00.
25%
1.
2.
3.
4.
0.0540
0.2356
0.1573
0.9460
1.
25%
25%
2.
3.
25%
4.
Assume that adults have IQ scores that are
normally distributed with a mean of 100
and a standard deviation of 15. Find the
probability that a randomly selected adult
has an IQ greater than 131.5.
25%
1.
2.
3.
4.
0.1786
0.2456
0.9821
0.0179
1.
25%
25%
2.
3.
25%
4.
Assume that SAT scores are normally
distributed with a mean of 1518 and a
standard deviation of 325. If 1 SAT
score is randomly selected, find the
probability that it is less than 1550.
1.
2.
3.
4.
0.9999
0.3922
0.5392
0.5221
25%
1.
25%
25%
2.
3.
25%
4.
Assume that SAT scores are normally distributed
with a mean of 1518 and a standard deviation of
325. If 25 SAT scores are randomly selected, find
the probability that they have a mean that is less
than 1550.
1.
2.
3.
4.
0.6887
0.8997
0.00544
0.5392
25%
1.
25%
25%
2.
3.
25%
4.