Mathematics
Senior High
なぜ7.5になるんですか？途中式を教えてください🙇♀️
2-3
(3) E(X) = 300 0.75 = 225
V(X) = 300 0.75 0.25 = 56.25
6(X) = √√56.25 = 7.5
?
(21
o(X) =
=
8=31-21-
||
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