Question 1017778
Hi there,
Total:  -4 degrees, 6 degrees , 1 degree, 
11 degrees, 7 degrees, and -2 degrees. 
= 21/6 = 3.5 Average
For 7 days to have an average >5
the total would require to be 36
the seventh day would require to be
36 - 21 = 15 degrees.
Hope this helps :-)