The Socialist People's Libyan Arab Jamahiriya: Head of state: Col. Muammar Qaddafi. Population: 3,245,000 (1979). Capital: Tripoli. Language: Arabic, although some Berber-speaking villages remain. Religion: Almost all Libyan Arabs follow Sunni Muslim rites. Currency: Libyan dinar (LD). (3.41 LD equals $1.00 US). GNP per capita: $9,000 (est. 1981). Area: 679,358 sq. miles 95 percent of which is desert or semi-desert land. Libya is larger than Alaska and the six New England states combined. Army: 55,000 men plus a ''people's militia'' of several thousand. Main export: Crude petroleum (99 percent). Oil revenue estimated for 1981: $15 billion. Oil production: 750,000 barrels per day (July 1981). Ranks 15 in world production. Main agricultural products: Barley, wheat, olives, tomatoes, almonds, citrus fruits.