Converting NORMSINV() of excel to normal mathematical formula?

Question

Do anyone know a mathematical formula for NORMSINV() function of excel?

please help me.

Answer 1

=Norminv(probability,mean, standard_dev)



is the Inverse of the Cumulative Normal Probability Distribution.



A normal random variable is continuous so the

Cumulative distribution is the integral of the density.



If you don't understand what I meant by integral, you

may need to just know that you need calculus , a

type of math where you study limits, derivatives(rates of change) and integrals(areas of unusual regions)to under

to understand this mathematical formula. Students

who have had no calculus are told to accept the normal

distribution on faith. In that case you will need to read no

further. If you have some calculus, we'll continue.





We'll construct the formula for the standard cumulative normal first. That would be Excel's =NORMINV(x,0,1)



The normal density function for µ=0,σ =1 is



f(x) = [(1/√(2π)] times e^( [-x²/2])



and =NORMINV(x,0,1) = ⌡ f(x) dx integrated from

limits -∞ to x



If µ and σ are any general values then the

density function is



f(x) = [(1/ σ√(2π) ] times e^( [(-1/2)* [(x-µ)/σ]²)



and for the above f(x)



=NORMINV(x,µ,σ) = ⌡ f(x) dx integrated from

limits -∞ to x



You can study the link I've included if you want to see how

calculus applies to statistics if you've had calculus but

never had a calculus based statistics course. .

The normal distribution formula appears near the bottom of

that link .

Answer 2

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I see this is more of a visual template. Not a fan. I don't know what cells you're using but it might look something like the following: =SUM(IF(ISTEXT(C6:K6), .5, 0)) You will need to press Ctrl+Shift+Enter instead of just Enter when entering the formula. This is assuming your original formula returns the number of hours scheduled—which you didn't state was or was not the case—and that you want this formula to return a maximum of 4.5 when all nine cells are filled with text. [Personally, I would just use start/end times, for which you can just use simple subtraction to obtain a result. You could also use a chart to visualize the shifts, rather than the cells themselves. With this method, you do have to adjust for how Excel calculates times (as decimal portions of integer days), but the formulas better illustrate their intent.]

Answer 3

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