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.Less than 200 hours
A. 7
B. 4,444
C. 5
D. 10
Answer: C
Mathematics
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Evaluate the integral.
A. - 
cot38x + 
cot 8x + C
B. - 
cot38x + 
cot 8x + x + C
C. - 
cot38x + cot 8x + x + C
D. - 
cot38x + 
cot2 8x + x + C
Mathematics
Solve the problem.Six people from different occupations were interviewed for a survey, and their annual salaries were as 
and 
What is the mean annual salary for the six people?
Fill in the blank(s) with the appropriate word(s).
Mathematics
Find the root if it is a real number.
A. 10 B. -2 C. -10 D. 2
Mathematics
Approximate 
using a Reimann sum with n = 4 .
What will be an ideal response?
Mathematics