Working out different to mark scheme

Hello,

When doing binomial in MS1B/SS1B, I have never been taught to write out my working this way:

Instead we were taught to write out what we'd input into out calculator: binomialpdf (or binomialcdf) i.e. (Binomialpdf(50, 0.15, 6)).

I'd still get the right answer but I was wondering whether I'd be penalised by doing it this way.

Thanks.


Posted from TSR Mobile

Do you understand how they do it in the mark scheme? I'd do that method in your working out, and use your calculator to check.

Your calculator is doing all of the work for you really, and it's not showing you understand the formula for the binomial distribution, so I'm not sure if you would get marks for writing what you put into your calculator.

Do you understand how they do it in the mark scheme? I'd do that method in your working out, and use your calculator to check.

Your calculator is doing all of the work for you really, and it's not showing you understand the formula for the binomial distribution, so I'm not sure if you would get marks for writing what you put into your calculator.

This is the "what if I just write the answer" question all over again and you generally miss a method mark or indeed all of the marks.

Binomial coefficients flow from understanding permutations and combinations and just using the calculator divorces understanding from answering questions.

You need to be able to look at the binomial coefficient formula and really understand where each part comes from in terms of Ps and Cs.