ch.7 statistics 2

Question 1

mean

Answer 1

• average

sum of outcome
————————
number of outcome

e.g. 5+7+9
———
3

    21
  ——
     3

= 7
mean = 7

Question 2

median

Answer 2

• middle number when arranged in ascending or descending order
  e. g. 5, 5, 7, 9, 9, 11, 12, 12, 13
• median = 9
• if u have an even number, u will have 2 in the middle
  e.g. 3, 6, 7, 9, 10, 11 - 7 and 9 in middle
  (7+9) divided by 2 = 16 divided by 2 = 8

Question 3

mode

Answer 3

outcome with bights occurrence (frequency)

Question 4

range

Answer 4

highest outcome - lowest outcome

e.g. 12-7 = 5 (range)

Question 5

outliers

Answer 5

• data points that are far from other data points

e. g. 2, 6, 5, 4, 3, 1, 15 - 15 = an outlier

Question 6

mid-interval

Answer 6

upper limit + lower limit 
————————————
                      2
e.g. 10 - 12 (10 = lower limit, 12 = upper limit)
12 + 10                   22
————       =     ———     =     11
      2                          2
mid-interval = 11