Class mark of the interval $20$-$30$ is
Class mark of the interval $20$-$30$ is
- $25$
- $10$
- $50$
- $30$
Solution
Class mark $= \dfrac{\text{lower} + \text{upper}}{2} = \dfrac{20+30}{2} = 25$.
Asked in: MH-SSC-9
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