Others Maths Puzzle

Mean and S.D of items are found to be 50 and 8 but while calculating those two items were taken as 45 and 55 instead of 54 and 46 fined correct S.D ?

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Others Other Question

10 workers can construct 1000 meter wall with 3 bricks of
width in 15 days then what is one man capability? by how many ways 7 friends can stay in 10 different hotel when no two friends can stay in the same hotel?