Question

for how many days was the temperature recorded?

Explanation:

Step1: Read frequencies from the bar - chart

For the temperature range 40 - 44°F, the frequency (number of days) is 3.
For 45 - 49°F, the frequency is 7.
For 50 - 54°F, the frequency is 8.
For 55 - 59°F, the frequency is 4.
For 60 - 64°F, the frequency is 5.
For 65 - 69°F, the frequency is 1.

Step2: Sum up the frequencies

$3 + 7+8 + 4+5 + 1=28$

Answer:

28