Question

. 100 lorries are required to transport raw materials from a quarry to a construction site. The time taken,
minutes, for the lorries to travel from the quarry to the construction site using a fixed route was recorded.
Time taken (t minutes)
Number of lorries
116 <i<118
1
118 << 120
6
120 << 122
23
122 << 124
28
124 << 126
27
126 << 128
9
128 << 130
5
130 < < 132
1
(i) Calculate an estimate for the mean travelling time of the lorries.
(ii) Find the fraction of lorries which took less than 124 minutes to travel from the quarry to the
construction site.
OXFORD
Chapter 17 Averages of Statistical Data
UNIVERSITY PRESS​

Answer 1

Answer:

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Answer 2

Answer:

1+6+23+28=58

Lesser time to took 124 minutes from quarry to cnstruction site = 58/100 =29/50