Question 3.236

lightningdeath

23. Lightning Deaths. Table 20 gives the frequency distribution of the number of deaths due to lightning nationwide over a 67-year period. Find the estimated mean and standard deviation of the number of lightning deaths per year.

Table 3.78: Table 20 Lightning deaths

Class	Years
	13
	21
	10
	6
	10
	7

Table 3.78: Source: National Oceanic and Atmospheric Administration.

3.3.23

Estimated mean = 135.5224; estimated standard deviation = 95.6874