The empirical rule states that in a normal distribution,
68% of data is within 1 std deviation of the mean
95% of data is within 2 std deviation of the mean
99.7% of data is within 3 std deviation of the mean
In this case 95% of the cases would be within two std deviations of the mean
mean - 8 and mean + 8
72 - 8 = 64 and 72 + 8 = 80
then 95% of the scores are between 64% and 80% on the test.
Answer:
Monday: 2 hours
Tuesday: 7 miles
Thursday: 27 miles
Friday: 2 hours
Step-by-step explanation:
Monday: 16 divided by 8 = 2
Tuesday: 21 divided by 3 = 7
Thursday: 9 x 3 = 27
Friday: 16 divided by 8 = 2
I hoped this helped
Answer: 18
Step-by-step explanation: 6 x 3 = 18, 18 x 1 = 18
8 chairs, 8 squared is 64,ie the amount of chairs in total
