Answer:
ii) Class boundary = 13.5 - 16.5
iii) Lower class boundary = 13.5
iv) Lower class limit= 14
i) Mean = 12.725
Step-by-step explanation:
To get the mean find the midpoint of all values
i.e (8+10)÷2 = 9
(11+13)÷2 = 12
(14+16)÷2 = 15
(17+19)÷2 = 18
(20+22)÷2 = 21
Next, we multiply the frequency of each data by the midpoint i.e to get FX
9×8=72
12×7=84 etc.
We use the formula : summationFX ÷ F(Total sum of frequency)
:509÷40
: 12.725
