The graph below shows the depth of water in a sea bath from 6.00 am to 8.00 pm.
 

1. What was the maximum depth, in metres, of water in the sea bath?  (1 mark)
2. The sea bath was open to the public when the depth of water was above 1.5 m.
   

    

   Between which times was the sea bath open?  (1 mark)