Mean of grouped continuous data for JEE

Formula

\(\bar{x}=\frac{\sum f_i m_i}{\sum f_i}\)

Variables: \(m_i\): class mark of the \(i\)-th class, \(f_i\): frequency, \(N=\sum f_i\).

Conditions: For grouped continuous data; class mark \(m_i=\frac{l_i+u_i}{2}\).

Approximate mean of grouped data.