Answer:

Step-by-step explanation:
So we have the expression:

Combine like terms:

Add:

And we're done!
Answer:
2.1
Step-by-step explanation:
Use the equation
Sum of elements = average x number of elements
sum = (6)(4)
sum = 24
Add up the numbers we know: 3.4 + 10.7 + 7.8 = 21.9
24 - 21.9 = 2.1
This means the fourth number is 2.1
Answer:
(0.55, 0.75)
Step-by-step explanation:
The range can be estimated to be 6 standard deviations wide. Therefore, the standard deviation is:
σ = (0.72 - 0.42) / 6
σ = 0.05
The margin of error is ±2σ, so:
ME = ±0.10
Therefore, the interval estimate is:
(0.65 - 0.10, 0.65 + 0.10)
(0.55, 0.75)
Answer:
B
Step-by-step explanation:
8*5/6= 20/3 which is equal to 40/6 or forty sixths
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