Evaluate 

\[\lim_{n\to\infty} \int_0^{\frac{\pi}{2}} \frac{[n\sin x]}{n}\ dx\]

where $ [x] $ is the integer equal to $ x $ or less than $ x $.
To evaluate the limit 

\[
\lim_{n\to\infty} \int_0^{\frac{\pi}{2}} \frac{[n\sin x]}{n}\ dx
\]

where $[x]$ is the floor function, we proceed as follows:

1. **Understanding the integrand**:
   The integrand is \(\frac{[n\sin x]}{n}\). The floor function \([n\sin x]\) represents the greatest integer less than or equal to \(n\sin x\). Therefore, \(\frac{[n\sin x]}{n}\) is a piecewise constant function that approximates \(\sin x\) as \(n\) becomes large.

2. **Behavior of the floor function**:
   For large \(n\), the difference between \(n\sin x\) and \([n\sin x]\) becomes negligible. Specifically, \(\frac{[n\sin x]}{n}\) will be very close to \(\sin x\), but always less than or equal to \(\sin x\).

3. **Integral approximation**:
   As \(n \to \infty\), \(\frac{[n\sin x]}{n}\) converges pointwise to \(\sin x\). Therefore, we can use the Dominated Convergence Theorem to interchange the limit and the integral, provided that the integrand is dominated by an integrable function. Here, \(\sin x\) is bounded by 1, which is integrable over \([0, \frac{\pi}{2}]\).

4. **Applying the Dominated Convergence Theorem**:
   We have:
   \[
   \lim_{n\to\infty} \int_0^{\frac{\pi}{2}} \frac{[n\sin x]}{n}\ dx = \int_0^{\frac{\pi}{2}} \lim_{n\to\infty} \frac{[n\sin x]}{n}\ dx = \int_0^{\frac{\pi}{2}} \sin x\ dx
   \]

5. **Evaluating the integral**:
   The integral of \(\sin x\) over \([0, \frac{\pi}{2}]\) is:
   \[
   \int_0^{\frac{\pi}{2}} \sin x\ dx = \left. -\cos x \right|_0^{\frac{\pi}{2}} = -\cos\left(\frac{\pi}{2}\right) - (-\cos(0)) = 0 - (-1) = 1
   \]

Conclusion:
\[
\lim_{n\to\infty} \int_0^{\frac{\pi}{2}} \frac{[n\sin x]}{n}\ dx = 1
\]

The final answer is \(\boxed{1}\).