Measures of location and spread

Question 1

Mean from frequency table

Answer 1

sum of (values x frequency) / sum of frequency

Question 2

Finding values on calc

Answer 2

Go to statistics(6)
Input values
Press AC
Press option
Press 1-variable calc

Question 3

Quartiles

Answer 3

Q1= n/4
Q2= n/2
Q3 = 3n/4

Question 4

Percentiles

Answer 4

(number percentile/100) x n

Question 5

Linear interpolation

Answer 5

class beginning data + ( difference from value and beginning value/ class frequency) x difference in class data

Question 6

Variance

Answer 6

(sum of squares of data / size) - (square of the mean)

Question 7

Standard deviation

Answer 7

square root of variance

Question 8

Code mean y=x-a/b

Answer 8

y= (mean of x )-a / b

Question 9

Code standard deviation y= x-a/b

Answer 9

standard deviation x / b

Question 10

Histogram data

Answer 10

group continuous

Question 11

Outliers

Answer 11

Q1-k(Q3-Q1)
Q3+k(Q3-Q1)

Question 12

Histogram frequency density

Answer 12

frequency/class width