The duration, in seconds, of telephone calls from an office over a two-week period are recorded. The recorded data is given in Table 9.12.

(a) What is the duration of the shortest call?

(b) What is the duration of the longest call?

(c) What is the range of the data set?

(d) Select convenient class intervals by dividing the range into 7 equal subclasses.

(e) Summarise the data in a grouped tally/frequency table.

(f) Illustrate the data by means of a histogram.

(g) Illustrate the data using a stem-and-leaf plot.

(h) Construct a cumulative frequency table for the data and plot a cumulative frequency curve.

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140 104 182 120 150 46 201 82 63 24 84 140 86 47 100 54 146 138 186 214 106 150 184 169 193 123 178 152 129 128 219. 41 106 49 106 154 134 148 53 104 109 119 74 167 127 36 108 89 165 207 37 164 165 54 29 140 142 49 198 186 52 110 141 76 104 125 230 40 127 67 130 149 133 158 225 160 112 220 98 150 117 157 191 182 135 117 187 155 163 70 124 137 205 132 128 94 77 49 90 140 104 92 112 96 163 116 118 Table 9.12 Duration of telephone calls in seconds 52 172 68