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Answer:
1. Question isn't complete. It says "Which gives the first two steps to evaluate" and cuts off.
2. Seems like 3.(4-2)2+1 if 3. means to multiply.
3. 9.1=9 should be the answer if . means to multiply.
4. 10x+0=10x
5. x=3 or y=-8
6. x=5 or y=-6
7. Not so sure about this one.
8. 7x/9y
9. 5
Step-by-step explanation:
2. 3.(4-2)2+1
3(2)2+1
6(2)+1
12+1
13
Answer:
c. [70.30, 74.70]
Step-by-step explanation:
Confidence interval is a range of values in which there is a specified probability that the value of a parameter lies within that range.
The confidence interval of a statistical data can be written as.
x+/-zr/√n .......1
Given;
Mean gain x = 72.5 cm
Standard deviation r = 4.5 cm
Number of samples n = 16
Confidence interval = 95%
z (at 95% confidence) = 1.96 (from the table)
Substituting the values we have into equation 1;
72.5 +/- 1.96×4.5/√16
72.5 +/- 2.20 cm
[70.30, 74.70]
Therefore, the 95% confidence interval is
[70.30, 74.70] cm
C. 2x+5
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