Question

The weights (in kg) of Grade 11 ICT follow a normal distribution and has a mean of 52 and standard deviation of 6. How many students have weights greater than 55?

Answer 1

$$P(X>55)=1-P(Z\le\frac{55-52}{6})$$ $$=1-P(Z\le0.5)\approx0.3085$$

30.85 %