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Statistics — MATHEMATICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9MATHEMATICSStatistics5 Marks
Question
Construct a grouped frequency table from the following data of the daily wages earned by $60$ labourers in a company. Take each class size as $7.25, 26, 34, 48, 39, 16, 55, 28, 37, 42, 45, 55, 28, 54, 53, 18, 35, 47, 44, 28, 55, 45, 39, 54, 21, 49, 45, 38, 29, 53, $$48, 44, 15, 28, 14, 32, 15, 44, 14, 15, 16, 41, 33, 52, 29, 34, 51, 22, 19, 37, 44, 25, 48, 38, 24, 52, 51, 42, 32, 27.$
✓

Answer

Minimum value of variate $=14$
Maximum value of variate $=55$
$\therefore$ Range
$=55-14$
$ =41$
Class size$=7$
$\therefore$ No. Of class intervals
$=\frac{41}{7}$
$=6$
Class Tally Marks Frequency
$14 - 21$ $IIII, IIII$ $9$
$211 - 28$ $IIII ,II$ $7$
$28 - 35$ $IIII, IIII I$ $11$
$35 - 42$ $IIII, III$ $8$
$42 - 49$ $IIII, IIII III$ $13$
$49 - 56$ $IIII ,IIII II$ $12$
  Total $60$

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