[R] More complex historgram

[Blue.Egg]

CID	DISTRICT	SCHOOL	YRofSTUDY	DATE.ENTRY	SEX	AGE	EGGS.M	EGGS.MII	EGGS.H
POBADN0130	PO	Badongo	0	18.1.08	2	11	0	-1	73
POBADN0117	PO	Badongo	0	18.1.08	1	10	0	-1	59
POBADN0160	PO	Badongo	0	18.1.08	1	11	0	-1	56
POBADN0112	PO	Badongo	0	18.1.08	2	10	0	-1	47
POBADN0053	PO	Badongo	0	18.1.08	1	8	0	-1	42
POBADN0141	PO	Badongo	0	18.1.08	2	11	0	-1	36
POBADN0056	PO	Badongo	0	18.1.08	1	8	0	-1	26
POBADN0127	PO	Badongo	0	18.1.08	1	10	0	-1	26
POBADN0136	PO	Badongo	0	18.1.08	2	11	0	-1	24
POBADN0153	PO	Badongo	0	18.1.08	1	11	0	-1	22
POBADN0092	PO	Badongo	0	18.1.08	1	9	0	-1	21
POBADN0087	PO	Badongo	0	18.1.08	1	9	0	-1	17
POBADN0145	PO	Badongo	0	18.1.08	1	11	0	-1	16
POBADN0107	PO	Badongo	0	18.1.08	2	10	0	-1	15
POBADN0118	PO	Badongo	0	18.1.08	1	10	0	-1	14
POBADN0150	PO	Badongo	0	18.1.08	1	11	0	-1	14
POBADN0079	PO	Badongo	0	18.1.08	2	9	0	-1	12
POBADN0121	PO	Badongo	0	18.1.08	1	10	0	-1	11
POBADN0158	PO	Badongo	0	18.1.08	1	11	0	-1	10
POBADN0148	PO	Badongo	0	18.1.08	1	11	0	-1	7
POBADN0155	PO	Badongo	0	18.1.08	1	11	0	-1	6
POBADN0063	PO	Badongo	0	18.1.08	1	8	0	-1	4
POBADN0144	PO	Badongo	0	18.1.08	2	11	0	-1	2
POBADN0002	PO	Badongo	0	18.1.08	2	7	0	-1	0
POBADN0003	PO	Badongo	0	18.1.08	2	7	0	-1	0

I need to find out how can I on R, plot the mean egg of EGGS.H according to
the district, or sex.

Also how to compare the eggs of females on year of study x (in t.test)

Thank you!
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