標題:
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math questions~help plz
發問:
1.Find the digit in the ten-thousandth place of the series:1+(1/1!)+(1/2!)+(1/3!)+(1/4!)+.....A.1 B.2 C.5. D.7 E.82.A box contains ping pong balls. There are red ones, white ones, and blue ones. A red one is worth 10 points, blue is worth 5 points and white is worth 1 point. The Probability of drawing out a... 顯示更多 1.Find the digit in the ten-thousandth place of the series: 1+(1/1!)+(1/2!)+(1/3!)+(1/4!)+..... A.1 B.2 C.5. D.7 E.8 2.A box contains ping pong balls. There are red ones, white ones, and blue ones. A red one is worth 10 points, blue is worth 5 points and white is worth 1 point. The Probability of drawing out a red one is 15%, a blue one is 30%, and a white one is 55%. What is the mathematical expectation on any one draw? A.5.5 B. 1.3 C. 3.55 D. 4.5 E.2.5
最佳解答:
1.Find the digit in the ten-thousandth place of the series: 1+(1/1!)+(1/2!)+(1/3 !)+(1/4!)+..... A.1 B.2 C.5. D.7 E.8 Answer: B Since after 1/8!, the term is too little and cannot effect the answer Onlt consider 1+(1/1!)+(1/2!)+(1/3 !)+(1/4!)+(1/5!)+(1/6!)+(1/7 !)+(1/8!)+.... =2.71827877 So the digit in the ten-thousandth place of the series is 2 2.A box contains ping pong balls. There are red ones, white ones, and blue ones. A red one is worth 10 points, blue is worth 5 points and white is worth 1 point. The Probability of drawing out a red one is 15%, a blue one is 30%, and a white one is 55%. What is the mathematical expectation on any one draw? ANSWER: NO the mathematical expectation on any one draw =10*15%+5*30%+1*55% =1.5+1.5+0.55 =4.55 So all answers are wrong
其他解答:
同意樓上問題二的回答，ｍａｔｈｅｍａｔｉｃａｌｅｘｐｅｃｔａｔｉｏｎ的確係用佢的計法，因為加埋的PROBABILITY=1，而且條問題係講draw一次 除非呢題問題出錯ｌａ
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