need explanation

QUESTION 8 The age of population of jurors in certain area is normally distributed with mean age of 38 years with a standard deviation of 6 years. If one juror is selected at random from this population, the following probabilities can be found without using either normal probability table or software? O a. The probability that the age of that juror is less than 30 years O b. The probability that the age of that juror is more than 30 years O c. The probability that the age of that juror is less than 38 years O d. The probability that the age of that juror is more than 40 years