Qualification > Math

S1 and S2 DOUBTS HERE!!!!

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EMO123:

--- Quote from: astarmathsandphysics on April 24, 2011, 09:09:59 am ---prob solved in attachment

--- End quote ---
thanx Mr. Paul

astarmathsandphysics:
No probs

Malak:
Need help with this question

Part (e) to find median
I know we use interpolation but i am confused with the values to use for the upper/lower cumulative frequency..
thx

This is S1 Q5 from 2007 Jun

mdwael:

--- Quote from: ang3l on April 30, 2011, 04:02:50 pm ---Need help with this question

Part (e) to find median
I know we use interpolation but i am confused with the values to use for the upper/lower cumulative frequency..
thx

This is S1 Q5 from 2007 Jun

--- End quote ---


First of all make a cumulative frequency table.

you have a total of 100. Thus median should be the 50th entry.. so when you make the cf you will find the the 50th tab lies in 14-18 class and Cf is 26-50.. here it is not neccessary to do interpolation because 50 is the last one in the class so you can directly pick median of t is 18 seconds. but you can still do interpolation to check your answer.


    (X - 14) / 18-14 = 50-26 / 50 -26

X-14 / 4 = 1

X-14 = 4

X = 14 + 4 = 18


In the same manner u find the quartiles... since the  total frequency is 100 so lower quartile is 100/4 = 25 and upper is 100*3/4 = 75th entry

mdwael:
I have a question regarding Normal Distribution..

I understand how to get and find probabilities but how do you find the mean and standard deviation when the lower quartile and upper quaritle are given? like in this question..

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