The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. the distribution of the number of daily requests is bell-shaped and has a mean of 50 and a standard deviation of 11. using the 68-95-99.7 rule, what is the approximate percentage of lightbulb replacement requests numbering between 39 and 50?

34% of lightbulb replacement requests numbering between 39 and 50.

Step-by-step explanation:

The 68-95-99.7 rule states that, for a normally distributed random variable:

68% are within 1 standard deviation of the mean(34% between one standard deviation below and the mean, 34% between the mean and one standard deviation above the mean).

95% are within 2 standard deviations of the mean.

99.7% are within 3 standard deviations of the mean.

In this problem, we have that:

The distribution of the number of daily requests is bell-shaped and has a mean of 50 and a standard deviation of 11.

Using the 68-95-99.7 rule, what is the approximate percentage of lightbulb replacement requests numbering between 39 and 50?

50 is the mean

39 is one standard deviation below the mean.

This means that 34% of lightbulb replacement requests numbering between 39 and 50.

50.6

step-by-step explanation:

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,