Find the mean of the first four test scores first.
(Add all numbers in set and divide by how many numbers there are)
81 + 87 + 71 + 89 = 328 / 4 = 82
Then, find the mean with the 85 added as the fifth term.
81 + 87 + 71 + 89 + 85 = 413 / 5 = 82.6
The impact that the 85 had on the mean test score was that the mean/average increased by 0.6.
Answer:
x=y-4
Step-by-step explanation:
y=x+4
-4
y-4=x
51 ÷ 3 = 17
17 were in the van
51 - 17 = 34
34 were in the bus
Answer:
below
Step-by-step explanation:
that is the procedure above
Answer:
x=1/2; y=-6
Step-by-step explanation:
2x-2=-2x-5
4x=2
x=1/2
y=-1-5
y=-6