In a recent study of animal sleep times at the zoo, the mean amount of sleep per night is 6.3 hours with a standard deviation of 2.1. If 23 animals are selected, find the probability that the mean sleep time per night is greater than 8 hours. 0.0103
0.2981
0.3207
0.0001

0.001

hope this helped a bit!

Using the same reasoning as in your other question (26611591),

Pr[X > 8] = Pr[(X - 6.3) / (2.1 / √23)) > (8 - 6.3) / (2.1 / √23)]

… ≈ Pr[Z > 3.8823]

… ≈ 1 - Pr[Z ≤ 3.8823]

… ≈ 0.0000517281

… ≈ 0.0001

3/4 ÷ 3/4

step-by-step explanation:

basically divide any proper fraction with itself to fit the criteria.

so if we are using 3/4, then:

3/4 ÷ 3/4 = 1

so 1 is the quotient.

and the numerators for both these fractions is 3.   and if we divide the numerators:

3 ÷ 3 = 1

we see that quotient is equal to our original quotient as well.

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step-by-step explanation: