The height (in feet) of a sample of trees in the school playground: 12.5, 9.8, 13.5, 11.2, 12.3, 14.2, 11.7, 9.8, 12.6, 10.4
a. mean = 13.1 ft; standard deviation = 1.43 ft
b. mean = 11.8 ft; standard deviation = 4.52 ft
c. mean = 11.8 ft; standard deviation = 4.52 ft
d. mean = 11.8 ft; standard deviation = 1.43 ft

The answer is the option D

mean = ; standard deviation =

Step-by-step explanation:

we have

set of data

step 1

Find the mean

To find the mean sum the values of the data set an then divided by the total numbers of the data set

so

step 2

for each number: subtract the Mean and square the result

step 3

work out the mean of those squared differences

this value is called the "Variance"

step 4

The standard desviation is equal to to take the square root of the variance

standard desviation=

the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing

step-by-step explanation:

4 + 5 7/9= 9 7/9

step-by-step explanation: