Qualification > Math
S1 and S2 DOUBTS HERE!!!!
silvercameron:
thankyou,sir.oh, but my i already know about this method, but when solving some questions like this, i sometimes get the wrong answer.
astarmathsandphysics:
Give examples. This method is for Edexcel.
silvercameron:
A question:
An ordinary dice was thrown 50 times and the resulting scores were summarised in a frequency table. The mean score was calculated to be 3.42. It was later found that the frequencies 12 and 9,of two consecutive scores,had been swapped. What is the correct value of the mean?
astarmathsandphysics:
differene of12n+9(n-1)-12(n-1)-9n==12-9=3
3/50=0.06
3.42+0.06=3.48
or 3.42-0.06=3.36
Sea Lover:
can somone help me with these two questions:
1-Three letters are selected at random from the word SCHOOL.Find the probablity that the selection:
a)does not contain the letter O
b)contains both letters O
2-In how many different ways can a football team of 11 players be photographed if there are to be two rows ,with 5 seated on the front row and 6 standing in the back row?In how many of these photographswould the captain be sitting in the centre of the front row?
thanx in adavnce
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