Sherry missed the lesson on normal distribution and needs to do her homework. Explain to Sherry how to use the mean and standard deviation of a normal distribution to determine the top 7% of the population.

Question

anonymous · Answer

explain the use of calculator too ?

anonymous · Answer

@HatcrewS what do you mean?

anonymous · Answer

@zepdrix @tejasvir

anonymous · Answer

N~(mean, standard deviation^2)
recognise that top 7% is action the 93th to 100th percentile, i.e. P(x>93)

anonymous · Answer

so how exactly do i find the mean and standard deviation? @hatcrewS

anonymous · Answer

mean is np where n= sample size and p = probability
realise that i typed standard deviation^2, which is the square of standard deviation, 
you can get square of standard deviation by npq where q = (1-p)

note that the square of standard deviation is same as the variance

anonymous · Answer

i'm honestly so confused, i'm sorry i'm really trying to understand this @HatcrewS

anonymous · Answer

would you be able to guide me a bit more?

anonymous · Answer

hmm.. what is it that you dont understand

anonymous · Answer

how to do the problem lol

anonymous · Answer

do you know how to use the calculator to find the probability of normal distribution ?

anonymous · Answer

@HatcrewS no

anonymous · Answer

@HatcrewS

anonymous · Answer

@Dscdago please help it's literally my second to last question and i'm done with my course

anonymous · Answer

can you tell me what do you know abt normal distribution so its easier for me to guide ?

anonymous · Answer

basicially for normal distribution, 

N~(np, npq)

anonymous · Answer

i really know nothing i'm sorry

anonymous · Answer

npq gives you the variance, which is the same as the square of standard deviation

anonymous · Answer

this is making no sense for me, would you be able to do it and then explain how you did it? @HatcrewS

anonymous · Answer

i can do it but u cant see.. cuz most of the calculations is done using calculator

anonymous · Answer

so how would i be able to answer this?? you're supposed to be able to type it as sentences for the answer @HatcrewS

anonymous · Answer

@HatcrewS

anonymous · Answer

@zepdrix

anonymous · Answer

please it's now the last question i have and i just need it answered in words @HatcrewS