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 500 hours
A. 3,000
B. 2,500
C. 1,000
D. 2,400
Answer: B
Mathematics
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Replace the Cartesian equation with an equivalent polar equation.x2 + y2 - 4x = 0
A. r sin2? = 4 cos ? B. r = 4 sin ? C. r cos2? = 4 sin ? D. r = 4 cos ?
Mathematics
Use the properties of limits to evaluate the limit if it exists.
A. -8 B. Does not exist C. 5 D. 0
Mathematics
A student sets up an investment program and invests $140 at the end of each month into an account that earns an annual interest rate of 3% compounded monthly. Find the value of the investment after 20 years.
a. $46,077.19 b. $45,962.28 c. $47,341.15 d. $102,217.19
Mathematics
Write an equation for the line with an x-intercept of -4 and y-intercept of 16.
What will be an ideal response?
Mathematics