(i) A grouped frequency distribution table of class size 2 has to be constructed. The class intervals will be -84 - 86, 86 - 88, and -99 - 90...
By observing the data given above, the required table can be constructed as follows.
(ii) It can be observed that the relative humidity is high. Therefore, the data is about a month of rainy season.
(iii) Range of data = Maximum value — Minimum value
=- 99.2 + 84.9 =- 14.3