Concrete is usually prepared in ____.

A. batches
B. mixes
C. ready-mixes
D. stations


Answer: A

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Three components are randomly sampled, one at a time, from a large lot. As each component is selected, it is tested. If it passes the test, a success (S) occurs; if it fails the test, a failure (F) occurs. Assume that 80% of the components in the lot will succeed in passing the test. Let X represent the number of successes among the three sampled components.

a. What are the possible values for X?
b. Find P(X=3).
c. The event that the first component fails and the next two succeed is denoted by FSS. Find P(FSS).
d. Find P(SFS) and P(SSF).
e. Use the results of parts (c) and (d) to find P(X=2).
f. Find P(X=1).
g. Find P(X=0).
h. Find .
i. Find .
j. Let Y represent the number of successes if four components are sampled. Find P(Y=3).

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The ____________________ of fish may have begun when people caught more fish than they could eat and needed a way to store them

Fill in the blank(s) with correct word

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A load of 325 amperes for a 650 cold cranking amperage battery is the correct capacity load test amperage.

Answer the following statement true (T) or false (F)

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Technician A says that low hydrogen arc welding electrodes should be used when it is necessary to weld on a hardened steel frame rail. Technician B says that tempered steel rails can be MIG welded using appropriately rated wire in less time and lower risk of comebacks. Who is correct?

A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B

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