Practice Set 3

About This Set

These questions are at the level of the harder Tier 2 items: two missing frequencies found from a given mean, median or mode together with the total, a cumulative 'more than' table turned back into class frequencies, a standard deviation worked out again after a wrong value is corrected, and two batsmen compared by their coefficients of variation. In most of them the table has to be rewritten before any formula is used, so set out the columns ($x$, $f$, $cf$, $fx$) neatly, and keep in mind that for grouped data the median position is $\frac{N}{2}$ even when $N$ is odd. Allow about 35 minutes. If you get 18 or more right, go on to the PYQ Practice Sets; if not, redo the ones you missed first.