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 470 seconds and a standard deviation of 50 seconds. Find the probability that a randomly selected boy in secondary school will take longer than 355 seconds to run the mile.
A. 0.4893
B. 0.5107
C. 0.9893
D. 0.0107
Answer: C
Mathematics
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Find the simple interest. The rate is an annual rate unless otherwise noted. Assume 365 days in a year and 30 days per month. Round to the nearest cent.$7000 at 5.07% for 22 months
A. $650.65 B. $65,065.00 C. $7807.80 D. $16.13
Mathematics
Solve the problem.The shape and density of a thin shell are indicated below. Find the coordinates of the center of mass.Shell: cylinder x2 + z2 = 4 bounded by y = 0 and y = 1Density: constant
A. 
B. 
C. 
D. 
Mathematics
Solve the equation.
= 3 + 
A. No solution B. -5, -8 C. 5, 8 D. -1
Mathematics
Simplify the expression. Write your answer without negative exponents. Whenever an exponent is negative or zero, assume that the base is not zero.
-4
A. 
B. 
C. 
D. 
Mathematics