For question 7d I got 41.875 but then for some stupid reason rounded it to 41.82 so will I lose the mark because I rounded wrong? Will this affect me getting the marks in the second part? Thanks
How were you meant to do the last two questions on the paper?
Use E(x) for a discrete distribution as sum of xf(x) and you get around 41.875 I think
Edit: E(x) = 50(27/40) + 25(13/40) = 41.875
you would then go on to say that if he sold n bags he would expect 41.875n pounds, but if he removed staples he would get 0.8n*50=40n. As 41.875>40, he should not remove staples.
I just took a SS of my answers in word - I can't figure out how to formatt on this reply box! XD Here is a neater version of what I wrote - Please Tell Me if I got any wrong. EDIT: For Q1 a) I wrote 1.44 for the mean - This is just a typo - I actually wrote 1.41. Which seems right.