=+4.68 ● Age at diagnosis for each of 20 patients under treatment for meningitis was given in the paper “Penicillin in the Treatment of Meningitis” (Journal of the American Medical Association [1984]: 1870–1874). The ages (in years) were as follows:

18 18 25 19 23 20 69 18 21 18 20 18 18 20 18 19 28 17 18 18 21 18 20 18