The following frequency distribution of marks has mean $4.5$. Mark $1$ $2$ $3$ $4$ $5$ \

Question

The following frequency distribution of marks has mean $4.5$. Mark $1$ $2$ $3$ $4$ $5$ $6$ $7$ Frequency $2$ $4$ $6$ $9$ $x$ $9$ $4$ Find the value of $x$.[4] Write down the standard deviation.[2]

Accepted Answer

(a) $x=14$ (b) $1.54$

Statistics - Mean and Standard Deviation for Ungrouped Data

Statistics - Mean and Standard Deviation for Ungrouped Data

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