Homework Help: math

Posted by vilma on Friday, October 26, 2012 at 6:14pm.

Suppose the income (in tens of thousands of pesos) of employees at University
X can be approximated by a continuous distribution with density
f(x) =
(
2x􀀀2; if x 2
0; if x < 2
Find the probability that a randomly chosen employee has an income between P30,000
and P50,000.
2. 9 pts.
(a) Determine the value of c so that the following function is a probability density
function (pdf):
f(x) =
8>>><
>>>:
15
64
+
x
64
; if 􀀀 2 x 0
3
8
+ cx; if 0 < x 3
0; otherwise
(b) Find P(􀀀1 X 1).
(c) Find F(x), the cumulative density function.
3. 12 pts. Let X be a standard normal random variable. Find the following:
(a) P(0 X 1:42)
(b) P(􀀀0:73 X 0)
(c) P(􀀀1:37 X 2:01)
(d) P(X 1:13)
4. 5 pts. A fair die is tossed 180 times. Find

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