Answer:
d. 60k
Step-by-step explanation:
The sample mean is the midpoint between the lower and the upper limit of the confidence interval, that is, the sum of the lower and the upper limit divided by 2.
In this problem, we have that:
Lower limit: 50k
Upper limit: 70k
(50k + 70k)/2 = 60k
So the correct answer is:
d. 60k
0.6y + 0.02 = 0.3y - 0.4
Subtract 0.3y from both sides.
0.3y + 0.02 = -0.4
Subtract 0.02 from both sides.
0.3y = -0.42
Divide both sides by 0.3.
y = -1.4
Answer:
30.47
Step-by-step explanation:
Use the Pythagorian theorym
