The summer monsoon rains bring 80% of a country's rainfall and are essential for the country's agriculture. Records going back m
ore than a century show that the amount of monsoon rainfall varies from year to year according to a distribution that is approximately Normal with mean 856 millimeters (mm) and standard deviation 89 mm. Use the 68-95-99.7 rule to answer the following questions. Between what values do the monsoon rains fall in 95% of all years?
How small are the monsoon rains in the driest 2.5% of all years?
This is the concept of trigonometry, the distance from the foot of the ladder will be given by: tan theta=[opposite]/[adjacent] opposite=17 ft adjacent=x ft theta=37° thus tan 37=17/x x=17/tan 37 x=22.56 ft =22.6 ft (to the nearest 10th of a foot)
