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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Perform the indicated operations in the proper order.-7 - 42 - (-10)
A. -13 B. 19 C. 33 D. -33
Mathematics
Factor the polynomial completely.4x3 + 12x2y - 40xy2
A. (x - 2y)(4x2 + 20xy) B. 4x(x - 2y)(x + 5y) C. (4x2 + 8xy)(x - 5y) D. 4x(x + 2y)(x - 5y)
Mathematics
Write a formula for the nth term of the infinite sequence. Do not use a recursion formula.2, 4, 8, 16, 32, . . .
A. an = 2n B. an = 2n-1 + 1 C. an = 2n - 2 D. an = 2n
Mathematics
Identify the open intervals where the function 
is increasing or decreasing.
?
A. decreasing: 
; increasing: 
B. increasing:
; decreasing:
C. increasing on 
D. decreasing on
E. none of the above
Mathematics