Forty students have completed a math test. The mean score was 60 and a mean absolute deviation was 12. The teacher has decided to adjust the scores by adding 5 points to each test score. Calculate the new mean and mean absolute deviation.

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.

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)

im not sure

step-by-step explanation: