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Exam Hack | CIE A2 Maths | S2 | Probability Density Function Question (Patreon)

Published:
2022-10-14 01:37:18
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2026-06
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Adetona Adegbite

Please can you give me an explanation to question 6b I really need it

Intuitive
>>107302042

Because the function is quadratic with x intercepts at 0 and 20, thus the middle value or expected value of t 'E(T)' will be 10. (halfway between them)

Briyen Castel

hi can you please do the other topics ..like hypothesis testing

Aarnav

Please upload hypothesis videos sir

accountfor intuitive

How do you calculate probabilities where X is an absolute value? for i.e P( ∣X∣ > 2)

Intuitive
>>95870727

I haven’t seen a exam question like that but it would just be a piecewise function defined by two lines (f(x) = -x , for x < 0 & f(x) = x for x > 0). So, if you wanted to find something like P(|X| >2) you’d have to find two integrals between (-2, -infinity) & (2,infinity), where the infinity’s will be the start and finish of where the function is defined. If you send me an actual question on here or instagram I can do a written answer for you.

xDuutch

Quick question. second question part a. right before you integrate you add 1 to both the powers. is that a normal thing when youve moved the 3/16 to the other side?

Intuitive
>>95981301

I just times into the brackets by x, has nothing to do with the 3/16. "x*(4x - x^2) = 4x^2 - x^3".

xDuutch
>>95981301

ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh cheers bro. life saver.

Advaith Kumar
>>95870727

there is a question like this in march 2022. we need to find P ( |X| < 1) which is just P ( -1 < X < 1) or 2*phi(z) -1.