# Thread: Need help with Continuous probability Distributions

1. ## Need help with Continuous probability Distributions

Hi there.

I really need help with these questions:

use the standard normal table to find following probabilities

a. P(Z is greater than or equal to 1.7)
b. P(Z is greater than or equal to -0.95)
c. P(Z is less than or equal to -1.96)

sorry i dont know how to make the math symbols

My school teacher isnt much of a help so I kindly ask any of u guys to help me out with it. Thanks alot.

2. What are the parameters of Z?

3. The question just asks that Z denotes the time it takes to travel from home to school, so i would say 10 to 15 mins.

4. http://www.sjsu.edu/faculty/gerstman...fo/z-table.htm you can see table in here
So
$\displaystyle P(Z \geq 1.7) = 0.9554$

$\displaystyle P(Z \geq -0.95)$
$\displaystyle =1-P(Z\geq 0.95)=1-0.8289$

$\displaystyle P(Z \leq -1.96)$
$\displaystyle =1-P(Z\leq 1.96)$
$\displaystyle =1-(1-P(Z\geq 1.96))$
$\displaystyle =1-(1-0.9750)$

5. Hey man thanks alot for the help, i appreciate it much. Thanks again

6. If they tell you that Z is a standard normal random variable (or in this case to use the standard normal table), then you have your parameters as Z~(0,1).

7. I agree with ANDS. But your question does not specify any distribution of Z.

8. Originally Posted by Sambit
I agree with ANDS. But your question does not specify any distribution of Z.
Originally Posted by axz92
Hi there.

I really need help with these questions:

use the standard normal table to find following probabilities

a. P(Z is greater than or equal to 1.7)
b. P(Z is greater than or equal to -0.95)
c. P(Z is less than or equal to -1.96)

[snip]
The question implicitly specifies the distribution.

@OP: You are advised to get help from your teacher, review examples given in class notes and textbook or go to the library and borrow textbooks that have examples in them if you do not have a textbook.