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=

answer: $34.31

step-by-step explanation:

$11.99 x 3 = $35.97

$35.97 - 10% = $32.37

$32.37 + 6% = $34.31

1e+27

step-by-step explanation: