Sally and her friend Lucie started saving money for their vacation on the same day. Sally started with $150 and plans to add $5
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We have that the z-score is defined as z=
where X is the value of the observation, m is the mean of all the observations and sigma is the standard deviation. We also have that the z-score of the ends of the confidence intervals is 2.58 and -2.58. We have then, solving the first equation that :
Substituting the values for z, m and sigma, we have that the upper bound of the confidence interval is 90.32 minutes and that the lower bound is 18.08 minutes. Hence, almost all adults (99%) have a total time of watching TV in this interval.
Substituting the values for z, m and sigma, we have that the upper bound of the confidence interval is 90.32 minutes and that the lower bound is 18.08 minutes. Hence, almost all adults (99%) have a total time of watching TV in this interval.
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Step-by-step explanation:
The lateral surface area of a cylinder is calculated using:
We have that the lateral surface area is about, 80 square inches.
Assuming the radius is 10 inches, then we substitute r=10, π=3.14 and solve for h.
We solve for h to get: