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 540 hours and 780 hours
A. 2,215
B. 1,717
C. 2,217
D. 1,710
Answer: D
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Decide whether or not the following is a statement.July 4 was a Monday.
A. Statement B. Not a statement
Determine if the given value is a solution to the equation. Answer Yes or No.3x + 2 = 31; x = 9
A. Yes B. No
Provide an appropriate response.Under which of the following conditions do we know that two triangles are congruent? (More than one may apply.)(i) Three sides of one triangle are equal to the corresponding sides of the second triangle.(ii) Three angles of one triangle are equal to the corresponding angles of the second triangle.(iii) Two angles and the included side of one triangle are equal to the corresponding parts of the second triangle.
A. (iii) only B. (i) only C. (i), (ii), (iii) D. (i), (iii)
Use a graphing utility to find the sum of the geometric sequence. Round answer to two decimal places, if necessary.7 - 14 + 28 - 56 + 112 - ... + 7 ? (-2)8
A. 1195 B. 1197 C. 1204 D. 1191