A student performs a titration with different burettes and finds titre values of 25.2 ml,25.25 ml and 25.0 ml. How many significant figures are present in the average titre value?

Average titre value = $\frac{25.2+25.25+25.0}{3}$

Since two of the titre values have significant digits only up to one place after the decimal, the sum should have figures only up to one place after the decimal. Since the number of titre values is 3, is  a counted number, it has an infinite number of significant digits and will not determine the number of significant figures. Thus, the number of significant figures is 3