Here is a list of numbers. 9
7
5
10
5.
3
a) Work out the median.
(2)
Josh picks at random one of the numbers
b) What is the probability that he picks an even number?
|?||?|| 8
Basil has five numbered cards.
Two of the numbers are hidden
4|| 9
The mode of the five numbers is 8
The mean of the five numbers is 6
c) Work out the two hidden numbers
23
Total marks

1. why is a frequency distribution useful? it allows researchers to see the "shape" of the data. it tells researchers how often the mean occurs in a set of data. it can visually identify the mean. it ignores outliers. 2. the is defined by its mean and standard deviation alone. normal distribution frequency distribution median distribution marginal distribution 3. approximately % of the data in a given sample falls within three standard deviations of the mean if it is normally distributed. 95 68 34 99 4. a data set is said to be if the mean of the data is greater than the median of the data. normally distributed frequency distributed right-skewed left-skewed