Most authorities accept ____ piping as a safe means of conveying a combustible gas to its final destination.
A. plastic
B. sweated copper
C. threaded steel
D. PEX
Answer: C
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The lifetime, in years, of a certain type of pump is a random variable with probability density function
a. What is the probability that a pump lasts more than two years?
b. What is the probability that a pump lasts between two and four years?
c. Find the mean lifetime.
d. Find the variance of the lifetimes.
e. Find the cumulative distribution function of the lifetime.
f. Find the median lifetime.
g. Find the 60th percentile of the lifetimes.
An iron block can distort if allowed to hang from one end on an engine stand.
Answer the following statement true (T) or false (F)
Contour plowing increases soil erosion
a. True b. False Indicate whether the statement is true or false
A hybrid is a cross between unlike parents
Indicate whether the statement is true or false