The mean is sometimes called the arithmetic mean to distinguish it from other possible means. For example, a different mean, called the harmonic mean (H.M.), is used to average speeds. This mean is defined to be the sum of the reciprocals of all scores divided into the number of scores. For example, the harmonic mean of the numbers 4, 5, 6, 6, 7, 8 is
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Find the arithmetic mean and the harmonic mean of the numbers 2, 2, 4, 4, 7, 8, 8, 9, 9, and 10.
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Round your answers to the nearest hundredth.
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A. 
B. 
C. ?
D. ?
E. ?
Answer: A
Mathematics
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Evaluate the integral.
6x dx
A. 
x cot 6x - 
ln 
+ C
B. - x cot 6x + ln 
+ C
C. - 6x cot 6x + 36 ln 
+ C
D. - 
x cot 6x + 
ln 
+ C
Mathematics
Find the distance on the number line between the pair of numbers.3, -2
A. -5 B. -1 C. 5 D. 1
Mathematics
Solve the system analytically. x - y + 4z = 9-2x + 2y - 8z = 3 x + 5y + z = -12
A. {(3, -3, 0)} B. {(0, -3, 3)} C. ? D. {(3, 0, -3)}
Mathematics
Substitute the given values into the formula and solve for the unknown variable.I = prt; I = 76, p = 190, r = 0.08
A. 0.5 B. 1155.2 C. 5 D. 11.552
Mathematics