Research Hypothesis: Is there any difference in the mean literacy rate for the countries based on their

Research Hypothesis:

Is there any difference in the mean literacy rate for the countries based on their petroleum condition ( no petroleum, petroleum is a natural resource or OPEC member)?

The following table is obtained:

No Petroleum	Petroleum is a natural source	OPEC member
98.8	87.2	68
88	59.5	40.4
94	92.5	87.9
86.5	87.7	93.4
99	90.9	70
98	92.5	79.4
96.2	83	82.6
86.4	86.4	78.8
99.8	92.2	83.5
99.9	99.6	89
99.6	97.1	77.9
99.4	99.6
99.8	97.5
93.3	99
97.9	99
99.7	100
97.6	97
99	100
97.9	97
98.6	100
99
99
99
100
99
98
98
98
99.9
99
100