Solve the problem.A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 450 seconds and a standard deviation of 40 seconds. Find the probability that a randomly selected boy in secondary school can run the mile in less than 358 seconds.

A. 0.4893
B. 0.5107
C. 0.0107
D. 0.9893


Answer: C

Mathematics

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Estimate the slope of the curve at the indicated point.

A. 2
B. - 
C.
D. -2

Mathematics

Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real numbers.- 

A. y + x + 
B. y + x - 
C. y - x - 
D. y - x + 

Mathematics

Solve the problem. Round your answer, if appropriate.As the zoom lens in a camera moves in and out, the size of the rectangular image changes. Assume that the current image is 8 cm × 5 cm. Find the rate at which the area of the image is changing (dA/df) if the length of the image is changing at 0.7 cm/s and the width of the image is changing at 0.3 cm/s.

A. 11.8 cm2/sec B. 5.9 cm2/sec C. 14.2 cm2/sec D. 7.1 cm2/sec

Mathematics

The average daily food consumption F of a herbivorous mammal with body weight x, where both F and x are measured in pounds, is given approximately by the equation F =. Find the weight x of an elephant that consumes 400 lb of food per day.

(a) 15,000 lb (b) 20,000 lb (c) 10,000 lb (d) 5,000 lb (e) none of these

Mathematics