Qualification > Math
S1 and S2 DOUBTS HERE!!!!
silvercameron:
^^thankyou. now i can understand better and continue with my practice. :)
astarmathsandphysics:
no probs
silvercameron:
here's a question
Q) the mean snd standard deviation of the heights of 12 boys in a class are 148.8 and 5.4 cm respectively. A boy of height 153.4 cm joins the class. Find the mean and standard deviatiation of the 13 boys.
I found the mean but cant find SD.
____________________________
theres are formulas for finding median and quartiles in grouped data. But what if the data is not grouped and has large frequences and is summarised in a table.then how do we find the quartiles?
astarmathsandphysics:
see attachment
~ Miss Relina ~:
here is my question plz explain his answer
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