JAMB - Mathematics (1982 - No. 36)
Determine the mean monthly salary of 50 employees of a company from the following frequency distribution.
\(\begin{array}{c|c} \text{Monthly salary} & \text{Frequency}\\\hline N200.00 & 10\\ N325.00 & 5\\N100.00 & 20\\N120.00 & 2\\ N60.00 & 10\\ N80.00 & 3\end{array}\)
\(\begin{array}{c|c} \text{Monthly salary} & \text{Frequency}\\\hline N200.00 & 10\\ N325.00 & 5\\N100.00 & 20\\N120.00 & 2\\ N60.00 & 10\\ N80.00 & 3\end{array}\)
N215.30
N134.10
N143.10
N80.00
N50.30
Forklaring
\(\bar{x}\) = \(\frac{fx}{N}\)
= \(\frac{6705}{50}\)
= 1341
= N134.10
= \(\frac{6705}{50}\)
= 1341
= N134.10