In a psychology class, 57 students have a mean score of 96.7 on a test. Then 12 more students take the test and their mean score is 75.7. What is the mean score of all of these students together? Round to one decimal place. mean of the scores of all the students =

93.0

Step-by-step explanation:

96.7 x 57 = 5511.9

75.7 x 12 = 908.4

now add them

5511.9 + 908.4 = 6420.3

now find total students

57 + 12 = 69

now divide to find mean of all scores

6420.3/69 = 93.0478

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x