You are given

n = 8

measurements: 5, 3, 7, 9, 7, 6, 4, 8.

(a) Calculate the range, R.

R =

(b) Calculate the sample mean, x. (Enter your answer to three decimal places.)

x =

(c) Calculate the sample variance, s2, and standard deviation, s. (Round your variance to four decimal places and your standard deviation to two decimal places.)

s2 =

s =

(d) Compare the range and the standard deviation. The range is approximately how many standard deviations? (Round your answer to two decimal places.)

a) Range: The range is easily calculated by subtracting the lowest value from the highest value in the data set.

R = Maximum -minimum = 9-3 = 6,   So, R=6

b) Mean is the sum of all values in data set divided by number of elements in the data set

Mean = sum of all elements/total elements = 49/8 = 6.125

Mean = 6.125

c) Variance and Standard Deviation:

Variance is a measure of by how much the values in the data set are likely to differ from the mean of the values.

= 3.6094

Standard Deviation is square root of variance which is 1.90

s=1.90

d) Ration of range and standard deviation is

Range/s = 3.16, SO the range is 3.16 times the standard deviation.

i get you, what you should do is think of the positive things that would come out of it. it will make yours parents proud and raise your grade. you should always try and if you can't focus tell the teacher.