U3L6

Question 1

mean

Answer 1

Mean - most commonly known as the average.

Question 2

mode

Answer 2

Mode - the most frequently occurring value in a data set. There can be multiple modes if there are more than one value which occurs most often and some data sets don’t even have amode.

Question 3

median

Answer 3

Median - the middle number in an ordered list. How to find it - arrange data in ascending order and shave off numbers until the middle is found.

Question 4

moving average

Answer 4

Moving average
An average of a number of consecutive points from time series data
Used when data shows great fluctuation
A moving average takes the average of the previous n values

Question 5

weighted mean

Answer 5

Weighted mean

Normally used when calculating marks from classes with differently weighted “bins”.

Question 6

grouped data

Answer 6

Grouped data

Used when a given bar/histogram but we need to find midpoints or averages

Question 7

frequency

Answer 7

Frequency = f and Midpoint is the middle of the interval