Answer:
B
Step-by-step explanation:
B
Answer:
144 hope it helps
Step-by-step explanation:
The answer is (2,1). 2*2=4 and 9*1=9. 9+4=13
Step-by-step explanation:
What is it that you need help with exactly?
A+B=C
It's already been solved. Do you need it in a different form?
(a/(b/c)
Answer:
c. 3.6 and 10.4 hrs
Step-by-step explanation:
The Empirical Rule states that, for a normally distributed random variable:
68% of the measures are within 1 standard deviation of the mean.
95% of the measures are within 2 standard deviations of the mean.
99.7% of the measures are within 3 standard deviations of the mean.
In this problem, we have that:
Mean 7, standard deviation 1.7.
For about 95% of students, nightly amount of sleep is between
7 - 2*1.7 = 7 - 3.4 = 3.6 hours
7 + 2*1.7 = 7 + 3.4 = 10.4 hours
So the correct answer is:
c. 3.6 and 10.4 hrs