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.Between 290 hours and 540 hours
A. 3190
B. 1641
C. 1639
D. 3188
Answer: D
Mathematics
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Indicate to which set(s) the number belongs from the following choices: natural numbers, whole numbers, integers, rational numbers, irrational numbers, and real numbers. The numbers may belong to more than one set.
A. whole numbers, real numbers B. irrational numbers, real numbers C. real numbers D. rational numbers, real numbers
Mathematics
Which of the pictures does not illustrate a line of symmetry?
?
(A) 
(B) 
?
A. B B. A C. A and B D. Neither
Mathematics
Find the determinant of the given matrix.
A. -192 B. -180 C. 180 D. 168
Mathematics
Fill in the blank with one of the words or phrases listed below.
A polynomial with exactly 1 term is called a 
.
A. FOIL B. monomial C. trinomial D. binomial
Mathematics