1. Which of the following random variable would you expect to be discre te? A. The weighta of mechanically produced items B. The num ber of children at a Christmas party C. The times, in seconds, for a 100m sprint D. The lifetimes of resistors 2. x is a random variable, with mean and standard deviation a standardized form of x is z (X-4)/0. What are the mean and standard deviation, respectively of z? A. 0, 1 · The в. 1, 0 с. 2, 0 D. 2, 1 3. A distribution of data has a mean of 15 and a standard deviation of 2. How many standard deviations away fron the mean is a value of 13? A. One standard deviation above the mean B. Two standard deviation above the mean C. One standard deviation below the mean D. Two standard deviation below the mean atandard

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of your choice on a separa
1. Which of the following random variable would you expect to be discrete?
A. The weighta of mechanically produced items
B. The number of children at a Christmas party
C. The times, in seconds, for a 100m sprint
D. The lifetimes of resistors
2. x is a random variable, with meanH and standard deviation ở . The
standardized form of x is z = (X – µ)/0. What are the mean and standard
deviation, respectively of z?
А. О, 1
В. 1, о
С. 2, о
D. 2, 1
3. A distribution of data has a mean of 15 and a standard deviation of 2, How
many standard deviations away fron the mean is a value of 13?
A. One standard deviation above the mean
B. Two standard deviation above the mean
C. One standard deviation below the mean
D. Two standard deviation below the mean
4. The average waist size for teenage males is 29 inches with the standard
deviation of 2 inches, What is the z-score of a teenage male with a 33 inches
waist size?
A. -2
В. -1
С. 1
D. 2
5. If 99.7% of the teenage males in #4 will be considered, what are the limits of
their waist size?
A. 23 - 33 in
B. 23 -35 in C. 24 - 34 in
D. 25 - 35 in
6. What is the area that corresponds to z-value, z = 1.21?
B. 0.36650
C. 0.38686
A. 0.34375
D. 0.40320
Transcribed Image Text:of your choice on a separa 1. Which of the following random variable would you expect to be discrete? A. The weighta of mechanically produced items B. The number of children at a Christmas party C. The times, in seconds, for a 100m sprint D. The lifetimes of resistors 2. x is a random variable, with meanH and standard deviation ở . The standardized form of x is z = (X – µ)/0. What are the mean and standard deviation, respectively of z? А. О, 1 В. 1, о С. 2, о D. 2, 1 3. A distribution of data has a mean of 15 and a standard deviation of 2, How many standard deviations away fron the mean is a value of 13? A. One standard deviation above the mean B. Two standard deviation above the mean C. One standard deviation below the mean D. Two standard deviation below the mean 4. The average waist size for teenage males is 29 inches with the standard deviation of 2 inches, What is the z-score of a teenage male with a 33 inches waist size? A. -2 В. -1 С. 1 D. 2 5. If 99.7% of the teenage males in #4 will be considered, what are the limits of their waist size? A. 23 - 33 in B. 23 -35 in C. 24 - 34 in D. 25 - 35 in 6. What is the area that corresponds to z-value, z = 1.21? B. 0.36650 C. 0.38686 A. 0.34375 D. 0.40320
7. What is the area that corresponds to g-value, z-0.91?
B. 0.34375
C. 0.36650
D. 0.40320
A. 0.31859
8. If the area under the normal distribution is 0.44179 what z-value
correspond to it?
A. -1.57
B. -1.47
C. 1.56
D. 1.58
9. What is the area under the standard normal curve to the right of z - 2.67?
A. 0.0038
В. 0.0869
C. 0.1234
D. 0.9962
10. For the standard normal distribution, what is the area between z- 0.94 and
2=0.947
A. 0.1736
B. 0.3264
C. 0.6528
D. 0.8264
11. What value of z has an area of 0.20 to the left of z?
B. -0.84
A. 2.05
С. 0.84
D. 2.05
12.The distribution of heights of SHS male students is approximately normal
with mean 65 inches and standard deviation 2 inches. What percentage of
male students are taller than 69 inches?
A. 1%
В. 2.3%
С. 5%
D. 16%
13. The shelf life of a particular dairy products is normally distributed with a
mean of 12 days and a standard deviation of 3 days. About what percent of
the products will last between 12 and 15 days?
A. 2,5%
В. 16%
C. 34%
D. 68%
14. The mean life of a tire is 30,000 km and the standard deviation is 2,000 km.
What are the possible limits if 68% of all tires will be considered?
A. 24,000 km and 34,000 km
B. 26,000 km and 34,000 km
C. 27,000 km and 31,000 km
D. 28,000 km and 32,000 km
15.A company makes parts for a machine. The lengths of the parts must be
within a certain limit or they will be rejected. A large number of parts were
measured and the mean and the standard deviation were calculated as 3, 1m
and 0,005m, respectively. What are the limits if 99.7% of the parts were
accepted?
A. Between 3.075m and 3,125 m
B. Between 3.080m and 3,120 m
C. Between 3.085m and 3. 1 15 m
D. Between 3,090m and 3.110 m
12
Transcribed Image Text:7. What is the area that corresponds to g-value, z-0.91? B. 0.34375 C. 0.36650 D. 0.40320 A. 0.31859 8. If the area under the normal distribution is 0.44179 what z-value correspond to it? A. -1.57 B. -1.47 C. 1.56 D. 1.58 9. What is the area under the standard normal curve to the right of z - 2.67? A. 0.0038 В. 0.0869 C. 0.1234 D. 0.9962 10. For the standard normal distribution, what is the area between z- 0.94 and 2=0.947 A. 0.1736 B. 0.3264 C. 0.6528 D. 0.8264 11. What value of z has an area of 0.20 to the left of z? B. -0.84 A. 2.05 С. 0.84 D. 2.05 12.The distribution of heights of SHS male students is approximately normal with mean 65 inches and standard deviation 2 inches. What percentage of male students are taller than 69 inches? A. 1% В. 2.3% С. 5% D. 16% 13. The shelf life of a particular dairy products is normally distributed with a mean of 12 days and a standard deviation of 3 days. About what percent of the products will last between 12 and 15 days? A. 2,5% В. 16% C. 34% D. 68% 14. The mean life of a tire is 30,000 km and the standard deviation is 2,000 km. What are the possible limits if 68% of all tires will be considered? A. 24,000 km and 34,000 km B. 26,000 km and 34,000 km C. 27,000 km and 31,000 km D. 28,000 km and 32,000 km 15.A company makes parts for a machine. The lengths of the parts must be within a certain limit or they will be rejected. A large number of parts were measured and the mean and the standard deviation were calculated as 3, 1m and 0,005m, respectively. What are the limits if 99.7% of the parts were accepted? A. Between 3.075m and 3,125 m B. Between 3.080m and 3,120 m C. Between 3.085m and 3. 1 15 m D. Between 3,090m and 3.110 m 12
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