数学T paper 2讨论专区

walrein_lim88

新问题！谁可以教我Ace Ahead V2 quick check 1.5 第3题？
谢谢！
醉痴雪 发表于 14-4-2010 05:26 PM

醉痴雪

回复 242# walrein_lim88
谢谢！
那相同书q.c 1.5 第5题呢？

walrein_lim88

回复  walrein_lim88
谢谢！
那相同书q.c 1.5 第5题呢？
醉痴雪 发表于 14-4-2010 07:05 PM

   

whyyie

walrein_lim88

whyyie 发表于 15-4-2010 09:31 PM

   

觉悟-修罗之道

谁可以帮我解决。。。

oxford fajar Q.C 2.3 Q3 (d)

walrein_lim88

谁可以帮我解决。。。

oxford fajar Q.C 2.3 Q3 (d)
觉悟-修罗之道 发表于 17-4-2010 12:44 AM

    这里我不会画。。。。。。。
    很难解释如果没有SKETCH，除非我在MSN解释给你。。。

哈比人

1. a continuous random variable X is such that P(X<x) = mx + c for 1 < x < 5. calculate the values of m and c. Sketch the cumulative distribution function.

2. find the value of k if f(x) = ke^-x is the probability density function for x> 0. find the distribution function and sketch both functions.

3. a continuous random variable X takes values from 0 to 2. The probability that X takes a value greater than x is px^2 + q for 0 <x<2.
(a) determine the value of p and q       (b) find the probability density function

4. a continuous random variable takes values from 0 to k. the probability  that X takes a value greater than x is mx + 2 for 1<x<k.
(a) determine the value of k and m
(b) find the cumulative distribution function
(c) obtain the probability density function

5. for a continuous random variable, if f(x) = 2e^-2x, where x > 0, show that F(x) = 1- e^-2x. find the median value of x

whyyie

哈比人

帮忙解决 249 楼的问题.....救命

白羊座aries

ABCDEF is a regular hexagon with each of its sides measuring p units.By using unit vectors i and j to be along the directions of AB and AE respectively,and given that AB=4i,state the numerical value of p , and show that vector AC=6i+2surd 3 j.Find , in terms of i and j , the vectors AD,AEand AF

Log

卡贴 。。。。。。

白羊座aries

卡帖啊~，不要卡了..

白羊座aries

不是灌水，是卡帖

白羊座aries

不要再卡了

白羊座aries

卡帖变就没人帮我做了

白羊座aries

#252 请帮忙

whyyie

回复 252# 白羊座aries



还没教到, 不懂(BM 和MC)的做法对不对. AD, AE, AF 自己找找看


numerical value of p = 4

BM = (4 cos 60)i = 2i
MC = (4 sin 60)j = (4 surd 3)j / 2 = (2 surd 3) j

AB
= AM + MC
= (AB + BM) + MC
= (4i + 2i) + (2 surd 3) j
= 6i +  (2 surd 3) j

walrein_lim88

回复 252# 白羊座aries


   

Allmaths

需要各位的帮忙。。

A family consisting of 3 members A, B and C live in a house with one telephone line. The probabilities that when the telephone rings, the call is for A,B and C are 0.1, 0.5 and 0.6 respectiviely. The probabilities that A,B and C are in the house when the telephone rings are 0.7, 0.5 and 0.9 respectively. By assuming that all the probabilities above are independent of one another, find the probabilities that, when the telephone rings,
( a ) no one is in the house
( b) the call is for A who is not in the house

谢谢！