Answer:
The new mean would be 65, the deviation becomes 7
Step-by-step explanation:
We can show a mock exam result below with prior mean of 60
Showing 12 students instead of 40 as the same rate would change if 40 students totaled 60 mean than those with same mean as 12 students.
42 45 49 51 55 56 63 64 68 72 73 86
mean total =724/ 12 = 60.33
We add 5 to each test score
47 50 54 56 60 61 68 69 73 77 78 91
mean total = 784 /12 =65.33
The mean just increases at same rate.
