Answer:
B. 28
Step-by-step explanation:
Since (4x + 10) and 122 degrees are angles that are across from each other (vertical angles), they equal each other.
4x + 10 = 122
-10 -10
4x = 112
/4 /4
x = 28
Answer:
95% Confidence interval of the standard deviation: 3.33 ≤ σ ≤ 8.85
Step-by-step explanation:
Sample size = 10
Degrees of freedom = 10-1 = 9
For a 95% confidence interval, we have α=0.05, which gives 2.5% of the area at each end of the chi-square distribution.
We calculate the chi-square values for a 95% confidence interval
Value of chi-square_0.975 = 2.70
Value of chi-square_0.025 = 19.02
We then evaluate [/tex] for the two values of chi-square.
Then we have:
[/tex]
With these results we can express the confidence interval as
3.33 ≤ σ ≤ 8.85
Answer:
A
Step-by-step explanation:
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