The relative humidity (in %) of a certain city for a month of 30 days was as follows: 

(i) Construct a grouped frequency distribution table with classes 84 - 86, 86 - 88, etc. 

(ii) Which month or season do you think this data is about? 

(iii) What is the range of this data?

(i) We construct the grouped frequency distribution table by taking the class size 2 as follows,

(ii)  month or season do you think this data is about:

From the data we observe that, over period of 24 days the relative humidity was 92% and above 

So,  the relative humidity % is very high, it must be data from a month of the rainy season or monsoon such as July or August.

(iii) Range of the data = maximum value $-$ minimum value

=  99.2 $-$ 84.9

= 14.3