A95% confidence interval for a population mean μ is given as (18.7, 21.3). this confidence interval is based on a simple random sample of 48 observations. calculate the sample mean and sample standard deviation. assume that all conditions necessary for inference are satisfied. use the excel function t. inv as necessary to obtain values from the t-distribution in any calculations and give all answers to 3 decimal places.

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step-by-step explanation:

80° is the measure of gh

step-by-step explanation:

circle f is congruent to circle j

we have two circle with center f and j.

both circles are congruent. the radius of the circle would be equal.

see the attachment for the circle.

we are given ∠efd ≅ ∠gjh

therefore, arc (ed) = arc (gh)     (∴ circle f is congruent to circle j)

but ∠dfe=80°=arc (ed)

therefore, arc (gh) = 80°

thus, 80° is the measure of gh

hm let me think hm think think hm think yes