A report to Health Canada indicated that an intensive education program was used in an attempt to lower the rate of lung cancer development among females. After running the program, a long-term follow-up study of 50a females was conducted, which revealed the current rate of lung cancer development is 7.4 %.

Find the probability that 10 or less females have lung cancer development.

Assuming the program has effect, find the mean and standard deviation for the number of lung cancer cases in groups of 50a females.

Considering that unusual values are outside the interval -2, +2, is 20 females out of 50a females with lung cancer development unusually low or not?