Normal approx to the Binomial Distribution : ExamSolutions Maths Revision Videos

Tutorial on the normal approximation to the binomial distribution

[ExamSolutions_Maths]

This is always a debatable point. It does not affect the answer though. The reason for not writing the equals sign is that for a continuous r.v. you cannot equal the value. For example you could not draw a line that measures 5cm exactly as it may well be say cm

[leventenagy]

Haha I'm a first year chemical engineering student at Newcastle and these videos still give me more info than some of my lectures
Thanks so much

[AaronYoungDXB]

This particular example can be used with the Binomial Distribution Tables, without working out each individual probability, under n=30, p=0.4 and x<or = to 15 and the probability in the tables is 0.9029...

[ahmednaeem]

Keep up!!!
Excellent Work...
You are my CIE A level Mathematics Exam Saviour!!!

[hnguyen]

When do you use a Poisson distribution and when do you use a Normal distribution to approximate a Binomial distribution?
Thanks

[TheBigMallo]

im struggling to see why we approximate to the normal when you can use the binomial tables though? i would've gone to the table n=30 where p=0.4 and looked at where p(x<=15) which comes to 0.9029. I remember in one of my mocks I did something like this where it didn't say I needed to use the normal but I only got 2/7 marks and it looks like i have the right answer.

[alainlee]

Isnt it suppose to be square of npq on the bottom ?