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in a recent study of 45 ninth grade students, the mean number of hours spent studying was 6.8. the standard deviation was 1.3.
a. find the best point estimate of the mean.
b. find the 90% confidence interval.
c. find the 95% confidence interval.
d. find the 99% confidence interval.

what level of math? also i don't need to be paid if i can you.

it's d

step-by-step explanation:

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours

teleportation

step-by-step explanation: