Question

measure the length of 50 leaves and recorded the data in a tabulated form of group data of class of 3 calculate the mean of the collected data.
​

Answer 1

Length

(mm) x

i

f

i

f

i

x

i

108.5−117.5 113 4 452

117.5−126.5 122 6 732

126.5−135.5 131 14 1834

135.5−144.5 140 13 1820

144.5−153.5 149 6 894

153.5−162.5 158 4 632

162.5−171.5 167 3 501

∑f

i

=50 ∑f

i

x

i

=6865

⇒ Mean(

x

)=

∑f

i

∑f

i

x

i

=

50

6865

=137.3