The arithmetic mean of first 149 natural numbers is $\text{\_\_\_\_\_\_\_\_\_\_}$ .

The answer is 75.

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$\large \displaystyle \text{ Arithmetic mean for first 149 natural numbers } = \frac{1 + 2 + 3 + ........ + 149}{149}\\ \large \displaystyle = \frac{149 \times (149+1)}{2 \times 149} = \frac{150}{2} = \color{#20A900}{\boxed{75}}.$