Answer:
The standard deviation of that data set is 3.8
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 deviation of the mean.
99.7% of the measures are within 3 standard deviations of the mean.
In this problem, we have that:
Mean = 55
95% of the data fall between 47.4 and 62.6. This means that 47.4 is 2 standard deviations below the mean and 62.6 is two standard deviations above the mean.
Using one of these points.
55 + 2sd = 62.6
2sd = 7.6
sd = 7.6/2
sd = 3.8
The standard deviation of that data set is 3.8
Answer: 9
Step-by-step explanation:
We know that he can walk one mile in 1/3 of an hour. We can divide 3 by 1/3.
3/(1/3) When dividing by a fraction, we multiply its reciprocal instead.
3*3=9. This means that he can walk 9 miles in 3 hours.
Answer is 4.5 Show all
Steps below
For this case we have a function of the form:

Where,
A: initial amount
b: growth rate (if b> 1)
n: time in hours
Substituting values we have:

We have then that the initial amount is:

If b = 1.85 then the growth percentage is:
Answer:
here were initially 20 bacteria.
The hourly percent growth rate of the bacteria would be 85%