A company installs 5,000 light bulbs. The lifetimes of the lightbulbs are approximately normally distributed with a mean of 500 hours and a standard deviation of 100 hours. Find the approximate number of bulbs that can be expected to last the indicated amount of time.Between 290 hours and 500 hours
A. 2,410
B. 2,913
C. 2,413
D. 2,911
Answer: A
Mathematics
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Find the domain of the given function.f(x) = 
A. all real numbers x where x > -7
B. all real numbers x where x ? -7
C. all real numbers x where x > 
D. all real numbers x where x ? 7
Mathematics
Perform the indicated operation without the use of a calculator and express each answer in decimal notation.
A. 0.00142857 B. 700 C. 100 D. 0.07
Mathematics
Graph the system of inequalities.x2 + y2 ? 49x2 + y2 ? 16
A. no solution
B. 
C. 
D. 
Mathematics
Decide if the answer is reasonable or unreasonable by rounding the numbers and estimating the answer. If the answer is not reasonable, find the correct answer.80.2 ÷ 77.6 = 10.34
A. Unreasonable, should be 0.01034 B. Reasonable C. Unreasonable, should be 0.1034 D. Unreasonable, should be 1.034
Mathematics