(a(i))[1]
Find the probability that a person selected at random spends more than 100 minutes in the library.
(a(ii))[4]
Calculate an estimate for the mean time spent in the library.
(b)[2]
Complete the table of cumulative frequencies.
(c)[3]
On the grid opposite, draw the cumulative frequency graph.
(d(i))[1]
Use your cumulative frequency diagram to determine the median.
(d(ii))[2]
Use your cumulative frequency diagram to determine the interquartile range.
(d(iii))[2]
Use your cumulative frequency diagram to determine the 90th percentile.
(d(iv))[2]
Use your cumulative frequency diagram to determine how many people spend more than 30 minutes in the library.