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  1. W

    stats paper tomorrow help please

    i cant understand part ii of q7 variant 62 nov 09 The weights, X grams, of bars of soap are normally distributed with mean 125 grams and standard deviation 4.2 grams. (i) Find the probability that a randomly chosen bar of soap weighs more than 128 grams. ans=0.238 (ii) Find the value of k such...
  2. W

    S1 probability confusions

    i am confued about the terms in probability like what are independent, mutually exclusive and exhaustive events..??
  3. W

    math p3 question... please help

    november 08 question no. 8 An underground storage tank is being filled with liquid Initially the tank is empty. At time t hours after filling begins, the volume of liquid is V m3 and the depth of liquid is h m. It is given that V = 4/3 h^3 The liquid is poured in at a rate of 20m3 per hour, but...
  4. W

    S1 permutations question

    The letters of the word POSSESSES are written on 9 cards, one on each card. The cards are shuffled and four of them are selected and arranged in a straight line. How many arrangements are there of 4 letters. answer is 115 dont know how to do it
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