Normal distribution (4) : ExamSolutions

[rudezartist]

Hi, i have come across a problem in a june 2001 s1 paper.

The continuous random variable Y is normally distributed with the mean 100 and variance 256.

(a) Find P(Y-80)

(b) find k such that P(100-k (- or =)Y(- or =) 100+k)

i can do part (a), but i have never seen a question like (b) would u be able to help?

[ExamSolutions]

@rudezartist Yes - check out my tutorials and past paper worked solutions. There is a similar question on one of the papers I have done.

[iamsopoor9]

Im in my first year of university, I still use this guy's videos.

[tenettenet12]

omg! i get it now... this is very helpful

[masonboy15]

you sir are BRILLIANT ... You have a student here from trinidad and tobago who will be watching everyone of your videos! I have an exam on monday and u just cleared up something that was so difficult to me.

THANK YOU!

[ExamSolutions]

@masonboy15 Thank you - all the best in your exam

[kalj0506]

you have made something that used to be so confusing, so simple! thank you

[ExamSolutions]

@kalj0506 That's the aim - Making maths simple!

[jayrol93]

This is so helpful, thank you very much. Legend!

[SlashGnR09]

I don't think anyone else could make it look more clear and simple.

Thanks man :D

[ExamSolutions]

@SlashGnR09 Thanks for the complement.

[AtoZyzzyva]

It blows my mid how easy you make something look in just over 8 minutes, when my teacher couldn't do it over a few lessons, no matter how many notes I took down or how well I paid attention.

:D

[ExamSolutions]

@AtoZyzzyva Oh well, at least you have it now. Well done.

[taokanmi]

Is this the same for probability for less and equal? P(x <= 511)? Thank you

[ExamSolutions]

@taokanmi Yes

[01cloudwalker]

all so clear now, thanks

[ExamSolutions]

@01cloudwalker Pleasure

[SciFaiz]

Thank You



[ExamSolutions]

@SciFaiz No probs.