A ladder is 80 inches tall. How tall is it in feet and inches?
2 answers:
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Answer:
Step-by-step explanation:
We are given the following in the question:
Sample size, n = 67
Variance = 3.85
We have to find 80% confidence interval for the population variance of the weights.
Degree of freedom = 67 - 1 = 66
Level of significance = 0.2
Chi square critical value for lower tail =
Chi square critical value for upper tail =
80% confidence interval:
Putting values, we get,
Thus, (3.13,4.91) is the required 80% confidence interval for the population variance of the weights.
Formula for finding the area of a triangle: 
Where b is the base and h is the height.
Substitute the variables for the values.
A = 270
So, the area is 270 square centimeters.
Where b is the base and h is the height.
Substitute the variables for the values.
A = 270
So, the area is 270 square centimeters.