Question 1193194
This issue a paired t-test; the variable of interest is the difference from ideal. The mean you will want is the mean difference from ideal weight, and it is +15.3 here
Ho:d=<0 
Ha:d>0
alpha=0.02 p{reject Ho|Ho true}
test is a t(0.98, df=25)
critical value t>2.485 one way test
t=(15.3)/27.5/sqrt(26)
=2.84
Reject Ho, there is a significant difference in the mean difference between regular and ideal weight (from 0) in this sample.
p-value =0.0044