Answer:
see explanation
Step-by-step explanation:
(a)
The modal class interval is the interval which occurs most often.
20 < T ≤ 24 occurs 23 times and is therefore the modal class interval.
(b)
To estimate the mean assume temperature to be at the midpoint of each interval.
Hence
total = (6 × 10) + (8 × 14) + (13 × 18) + (21 × 22) + (2 × 26)
= 60 + 112 + 234 + 462 + 52
= 920
Count = 6 + 8 + 13 + 21 + 2 = 50
estimated mean = [tex]\frac{total}{count}[/tex] = [tex]\frac{920}{50}[/tex] = 18.4° C
