Please solve this using excel and explain how to achieve the answer and which excel formulas to use.

NORMAL DISTRIBUTION

1.

A new tax law is expected to benefit "middle income" families, those with incomes between $20,000 and $30,000. If family income ~ N($25000, $10000), what percentage of the population will benefit from the law?

2.

The mean June midday temperature in Desertville is 36C and the standard deviation is 3C a) Assuming this data is normally distributed, how many days in June would you expect the midday temperature to be between 39C and 42C?

b) What temperature can you expect in 10% warmest days in June?