I think the answer is 7 tens. I hope this helps, but I am pretty sure it is wrong maybe
First we must do 294 x 12 to find the total number of beds which is 3528 then we divide that by three which 1176 nurses total :)
The 99.87th percentile, or the area to the left of the 3 standard deviation mark it 99.87% better than everyone/everything else.
1 times X
2 times X
because X could be anything