Question

Suppose100 geology students measure the mass of an ore sample. Due to human error and limitations in the reliability of the​ balance, not all the readings are equal. The results are found to closely approximate a normal​ curve, with mean 81 g and standard deviation 1 g. Use the symmetry of the normal curve and the empirical rule as needed to estimate the number of students reporting readings more than 81 g Round to the nearest whole number if needed

Answer 1

Ans:

mean=81 g

As,normal curve is symmetrical around the mean,so 50% data falls above the mean and 50% below the mean.

So,50% of students will report readings more than 81g.

So,the number of students reporting readings more than 81 g=0.5*100=50