4.28. If the probability density function of some measurements is found to be 0.02X for Xs in the interval of 0 to 10, what is the probability that a measurement will be between 4 and 5? a. 0.01 b. 0.05 c. 0.09 d. 0.20

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Question 4.28
4.21. The following sample data was obtained. What 4.25. In the binomial expression:
is the expected ±3 sigma spread of the process,
assuming normal distribution?
16.10
16.13
16.21 16.23 16.16 16.14
16.16 16.16 16.11 16.08
16.16 16.18 16.15 16.15
16.20 16.18 16.13 16.14
16.17 16.22 16.15 16.15 16.17
16.14 16.20 16.13 16.20 16.18
16.17
16.10
a. 16.158±0.108
b. 16.200 ± 0.072
c. 16.173 ± 0.036
d. 16.158 ± 1.080
4.22. A distribution for time-to-failure processes
characterized by a failure rate that does not vary
with time is:
a. Weibull
b. Gemma
c. Lognormal
d. Exponential
4.23. Which of the following indicates an out-of-
control condition?
a. A trend of 5 points in an upward or
downward direction
b. 5 consecutive points either above or below
the center line
c. 2 of 3 consecutive points outside the 2-
sigma warning limits
d. No points outside the 3-sigma limits
4.24. A reliability test was terminated after a
combined total of 171 device-hours based upon
a pre-established time terminated plan. An
estimate of mean-time-to-failure (8) of 57 hours
was obtained. The lower 95 percent confidence
bound on the true population mean-time-to-
failure is:
a. 125 hours
b. 22 hours
c. 27 hours
d. 11 hours
a. 35
b. 42
a. The sum of the exponents of each term after
expansion is equal to the sample size
b. The sum of the coefficients of each term
after expansion is equal to the sample size
c. The sum of the exponents of all the terms
after expansion is equal to the sample size
d. The sum of the exponents after expansion
has no relation to the sample size
4.26. A music group has 7 members. How many
subgroups of 4 members can be formed from
the music group?
4.30.
a. 63%
b. 37%
4.27. The MTBF of equipment is 5000 hours.
Assuming a constant failure rate, its chance to
fail in 5000 hours of operation is:
a. 0.01
b. 0.05
4.29. Given:
Page <
c. 210
d. 840
4.28. If the probability density function of some
measurements is found to be 0.02X for Xs in the
interval of 0 to 10, what is the probability that a
measurement will be between 4 and 5?
3
c. 100%
d. 50%
a. 0.998
b. 0.9998
c. 0.9999
d. 0.999
MacBook Air
C. 0.09
d. 0.20
1 *
f(x)=e5 for x ≥ 0
5
Then X has a mean and a standard deviation of:
a. 5,5
b. 5, 1
c. 1,5
d. 0, 1
> of 6
The length of life of a transistor is exponentially
distributed with a failure rate of 0.002 failures
per 10,000 hours. The reliability of the transistor
for 1,000 hours is:
CONCEPTS
STATISTICAL
Transcribed Image Text:4.21. The following sample data was obtained. What 4.25. In the binomial expression: is the expected ±3 sigma spread of the process, assuming normal distribution? 16.10 16.13 16.21 16.23 16.16 16.14 16.16 16.16 16.11 16.08 16.16 16.18 16.15 16.15 16.20 16.18 16.13 16.14 16.17 16.22 16.15 16.15 16.17 16.14 16.20 16.13 16.20 16.18 16.17 16.10 a. 16.158±0.108 b. 16.200 ± 0.072 c. 16.173 ± 0.036 d. 16.158 ± 1.080 4.22. A distribution for time-to-failure processes characterized by a failure rate that does not vary with time is: a. Weibull b. Gemma c. Lognormal d. Exponential 4.23. Which of the following indicates an out-of- control condition? a. A trend of 5 points in an upward or downward direction b. 5 consecutive points either above or below the center line c. 2 of 3 consecutive points outside the 2- sigma warning limits d. No points outside the 3-sigma limits 4.24. A reliability test was terminated after a combined total of 171 device-hours based upon a pre-established time terminated plan. An estimate of mean-time-to-failure (8) of 57 hours was obtained. The lower 95 percent confidence bound on the true population mean-time-to- failure is: a. 125 hours b. 22 hours c. 27 hours d. 11 hours a. 35 b. 42 a. The sum of the exponents of each term after expansion is equal to the sample size b. The sum of the coefficients of each term after expansion is equal to the sample size c. The sum of the exponents of all the terms after expansion is equal to the sample size d. The sum of the exponents after expansion has no relation to the sample size 4.26. A music group has 7 members. How many subgroups of 4 members can be formed from the music group? 4.30. a. 63% b. 37% 4.27. The MTBF of equipment is 5000 hours. Assuming a constant failure rate, its chance to fail in 5000 hours of operation is: a. 0.01 b. 0.05 4.29. Given: Page < c. 210 d. 840 4.28. If the probability density function of some measurements is found to be 0.02X for Xs in the interval of 0 to 10, what is the probability that a measurement will be between 4 and 5? 3 c. 100% d. 50% a. 0.998 b. 0.9998 c. 0.9999 d. 0.999 MacBook Air C. 0.09 d. 0.20 1 * f(x)=e5 for x ≥ 0 5 Then X has a mean and a standard deviation of: a. 5,5 b. 5, 1 c. 1,5 d. 0, 1 > of 6 The length of life of a transistor is exponentially distributed with a failure rate of 0.002 failures per 10,000 hours. The reliability of the transistor for 1,000 hours is: CONCEPTS STATISTICAL
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