A)If three students scored 70 on a test and three other students scored 89 on the same test, find the mean, median & mode for the test scores. b) the mean scourge on a set of 21 tests is 74. What’s the sum of all the test scores?

a. Mean = 84.25. Median = 89. Mode = 89. b. Sum = 1554.

Step-by-step explanation:

a. Mean: add together 70, 89, 89, and 89, to get 337. Divide by 4 to get the mean, which is 84.25.

Median: The "middle" number, which is 89.

Mode: The number that occurs most often, which is 89.

b. 21 times 74 equals 1554. This is the sum of the test scores.

Hope this helps!

let soccer = x and golf = y

part a

1st equation: x + y = 125

2nd equation: x = y +45

part b

replace x in the 1st equation with the 2nd one:

y + 45 + y = 125

simplify:

2y + 45 = 125

subtract 45 from each side:

2y = 80

divide both sides by 2:

y = 80/2

y = 40

she plays golf for 40 minutes.

part c

no because she plays soccer for 45 minutes longer than golf 40 +45 =   85 minutes, not 80 minutes.