if on an average 9 ship out of 10 arrive safely to ports, find the mean and S. D. of ships returning safety out of a total of 500 ships.
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ਪਠੌਝਪਦਠਠਥਖਝਗਜਛਦਠਘਥਟਡਡਜਛਜਞਕਖਠਗੇਔਘਨਝਸਪਝਕਠਨਕਢਟਧਗਤਞਖਛੈਖਙਖੁਈਇਓਏਠਧਪਡਘਪਧਦਫਧਠਡਢਨਨਠਗਪਦਠਢਝਞਨਡਠਢਧਡਧਧਧਜੈਕਖੈਔਗਦੋਔਕੋਕੈਐਔਏਔਐਔਪਜਖਦਖਜਦਗਕਘਦਖਣੈਐਠਜਖਸਦਗਖੈਠੈਠਘਜਦੲਗਜਜਡੈਕਭੈਕਭੈਟਜਟਥਖਞਗਞਥਖਦਗਟਲਗਟਡਲਪਲਡਲਪਭਦਘਜਖਡਟਥਗਥਟਕਗਥਗਞਥਗਞਦਗਟਦਗਦਟਟਘਜਕਘਜਘਜਕਕਘਜਕਘਦਕਘਦਕਘਜਘਜਖਕਘਜਕਘਜਘਜਖਕਘਜਟਢਢਪਲਢਠਠਢਠਗਠ
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