A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution approximated by a normal curve. Find the approximate number of bulbs that can be expected to last the specified period of time.Less than 500 hours
A. 3000
B. 2500
C. 1000
D. 2400
Answer: B
Mathematics
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Solve the problem.Two cards are drawn in order from a well shuffled deck of 52 cards. The probability that both cards are hearts is given by
A. 
× 
.
B. 
.
C. 
× 
.
D. 
× 
.
E. none of these
Mathematics
Decide whether the argument is valid or invalid, and give the form (of valid or invalid argument) that applies.If the bough breaks, then the cradle will fall.
The cradle will fall.
A. Invalid; fallacy of the inverse B. Invalid; fallacy of the converse C. Valid; modus ponens D. Valid; reasoning by transitivity
Mathematics
Use < or > to complete the following. 148 km 
148 mi
A. > B. <
Mathematics
Find the root. Assume that all variables represent positive numbers.
A. x14y3 B. x7y3 C. x7y6 D. x12y4
Mathematics