The standard deviation for a random variable with probability density function f and mean ? is defined Find the standard deviation for an exponential density function with mean 10.

a. 3.3
b. 2
c. 5
d. 2.5
e. 10

e. 10

Mathematics

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Solve the problem.A ball is thrown downward from a window in a tall building. Its position at time t in seconds is given by  where s is in feet. How long will it take the ball to fall  Round to the nearest tenth, if necessary.

A. 3.6 sec B. 1.9 sec C. 2.7 sec D. 1.7 sec

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Mathematics

Find the mean and median using the graph of the distribution. Round to the nearest tenth if necessary. 

A. mean = 10; median = 9 B. mean = 9.7; median = 10 C. mean = 10; median = 9.7 D. mean = 9; median = 10

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Mathematics

Evaluate -(-x) for the given value of x.x = -32.90

A. 32.9 B. -32.90 C. -0.03 D. 0.03

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Mathematics

If possible, find the matrix product.Given A = , find A3.

A.
A3 = 
B.
A3 = 
C.
A3 = 
D.
A3 = 

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Mathematics