Item 5
The histogram shows the test results of students. Find the mean and the standard deviation.

a. What is the mean and the standard deviation? Round to the nearest hundredth.

Mean =

standard deviation =

b. What percent of the students tests scores fall within 1 standard deviation of the mean? Round to the nearest hundredth.

Percent of students who fall within 1 standard deviation of the mean = %

c. What percent of the students tests scores are more than one standard deviation above the mean? Round to the nearest hundredth.

Percent of students whose tests scores are more than one standard deviation above the mean = %

d. What percent of the students tests scores are more than one standard deviation below the mean? Round to the nearest hundredth.

Percent of students whose tests scores are more than one standard deviation below the mean = %

45 degres

step-by-step explanation:

sorey if i hav bad engelish im bad engelish

9.55 degrees.

step-by-step explanation:

the given angle is

1 cycle is equal to 2π radians. so 4π will be equal to two cycles.

5.166667π-4π = 1.166667π

hence, this angle goes a little more than negative x axis.

1.166667π-π= 0.166667π

hence, the reference angle is 0.166667π radians.

1 radian = 57.2958 degrees

now, in degrees, this should be equals to 9.55 degrees.

trapezoid

step-by-step explanation:

first i plotted all my points on a grid graph

i made sure all of them were in the correct quadrant

then i saw it was a trapezoid or a quadrilateral

see attached

step-by-step explanation:

given the function as;

write the equation replacing f(x) with y

form   and fill a table containing values of y with corresponding values of x

you can take a range for   values of x as -3≤x≤3

solving for x=-3

for x=-2

repeat the same procedure to get the values of y for the remaining ,x=-1 to x=3

plot the values of y against values   of x and obtain the following graph