Four Samples Of Three Observations Each Have Been Taken With Actual Measurements

For 77 the grand mean is 12.05, not sure where the 11.135 is coming from.For 78 you need to work with percents not numbers. Week 1 is .1, week 2 is .08 and so forth.For 83 the expected number is (60/2)+1=31 with a standard deviation of the square root of (60-1)/4)=3.84. See if you can get the rest.