Five number summary: 4.33, 5.05, 5.44. 5.79, 6.81

mean pH: 5.43
standard deviation: 0.54

Given the proportion of observations are within 68%, 95%, and 99.7%, what is the acidity of the rainfall in pH value?

1 answer

68% = mean ± 1 SD

95% = mean ± 2 SD

99.7% = mean ± 3 SD