Official TSR Mathematical Society

If you quote me I'm more likely to spot it
$\lambda = Var(X)$ Where X is the variable. $\lambda$ is just a Greek Letter

i will quote you from today onwards.
i really need help with my statistics! i was hoping if someone can just explain to me the whole chapter on
1) Probability distributions - continous variables
2)Normal Distribution
For now.

i have a test on this tuesday including those topics.

see you tonight!

Ask me a specific question - I can't just explain a whole chapter that I don't know about - what course is this? and whaddya mean see you tonight?

i mean see your reply tonight!

alright i will.

I await eagerly . . .

The probability density function of the net weight in pounds of a packaged chemical herbicide is
f(x)=2.0 for 49.75<x<50.25 pounds

a) determine the porbability that a package weighs more than 50 pounds.

Could you please explain about the topics which i have to know before i am able to attempt this question? And explain on this question further please?

First plot a graph to define the p.d.f of the random variable - the mass of herbicide.
Are you familiar with:
$\ P(x_1 \leq X \leq x_2) = \displaystyle\int^{x_2}_{x_1} f_x(u)\ du$?

No, i am not familiar with that. please epxlain?

Have you been taught any of this?

I did not take Alevel maths but i am taking statistics in University currently . and in lectures, its hard for me to catch up! And in my GCSE i took foundation Maths.. .

i

...

How do you put this into words?

If you have 2 different consecutive numbers. With whatever quantity for each...

Then the mean of them is:

1 - the probability of selecting the lower value + the lower value



Eg

5 5 5 6 6 6 6 6 6 6

Mean = 1 - P(5) + 5 = 5.7

I thought that was pretty cool

If you're still pondering...

Please help with this question .....I need full working solution as this question is from a past paper but my uni does not provides full working solution as I am really struggle to tackle this

Cheers