Swimming pool temperature

This task is about interpreting a time series graph.
A school caretaker measured the temperature of the water in the swimming pool over 14 days.
This is a graph of the results.
Water Temperature Over 14 Days
Graph of pool water temperature over time            

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a)  What was the temperature on Day Number 3?  ºC

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b)  On which day did the pool have the highest temperature?  Day number 

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c)  Which temperature was the most common?  ºC

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d)  For how many days was the temperature 23ºC?  days

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e)  What happened to the water temperature between Day Number 4 and Day Number 7?