solve for the standard deviation (s), variance (s²), first quartile (Q₁), second quartile, (Q_2,) third quartile (Q₃₎, (P₁₀) or 10th Percentile, (P₉₀) or 90th percentile,Skewness (Sk) and Kurtosis(Ku)

X or Class Interval	Tally	f	Xm	L-U	F
57-59		6	58	56.5 - 59.5	50
54 - 56		7	55	53.5 - 56.5	44
51-53		11	52	50.5 - 53.5	37
48-50		9	49	47.5 - 50.5	26
45-47		7	46	44.5 - 47.5	17
42-44		6	43	41.5 - 44.5	10
39-41	IIII	4	40	38.5 - 41.5	4
		n = 50