IB Maths AA SL 4.3 Summary statistics

IB Mathematics: analysis and approaches guide, first assessment 2021

Practise calculating and interpreting mean, variance, standard deviation, mode and missing data values from tables and constraints.

How this is tested

set up simultaneous equations from mean, range or variance to determine missing scores or frequencies
calculate means, mode, variance, or standard deviation from tabulated data
link the mean point to a regression line when using summary statistics inside a bivariate data question

[Maximum number: 2]

Data was collected on two variables, x and y, from eight members of a population. The data is shown in the table below.

(a)

Find $\bar{x}$ .

The regression line of y on x for this data is y=0.014375+2.1625 x.

[ 2 ]

(b)

Find

(i)

$\bar{y}$ ;