(i) In order to protect the ship from rough weather, the captain decided to slow it down. So he dropped the storm jib and lashed heavy mooring rope in a loop across the stern. Then they double-fastened everything and went through their life-raft drill. They also attached lifelines and wore life jackets. Thus, they got ready to face the storm.
(ii) To check the flooding of water in the ship, he took a canvas and stretched it across the holes, and made a waterproof hatch cover across the gaping holes which diverted the water to the side. When the two hands pump blocked and the electric pump short-circuited, he found another electric pump, connected it to an out pipe, and started it.
Find the mean deviation about the mean for the data 38, 70, 48, 40, 42, 55, 63, 46, 54, 44.