Which statement is true??
A) Atoms of the same element always have different number of neutron.
B) Atoms of the same element always have different atomic weights.
C) Atoms of the same element can have different numbers of neutrons.
D) Atoms of the same element can have different numbers of protons.

The weights of bags filled by a machine are normally distributed with a standard deviation of 0.05 kilograms and a mean that can be set by the operator. at what level should the mean weight be set if it required that only 1% of the bags weigh less than 9.5 kilograms? round the answer to 2 decimal places.