JEDDAH, 27 — Saudi Arabia has signed a contract with an international firm to study and estimate the market value of Saudi Telecom Company as part of its efforts to privatize the telecom industry, it was announced here yesterday. The announcement said the company will also publish a booklet on STC to provide the necessary information to potential investors. STC plans to float part of its shares for public subscription by Saudis by the end of this fiscal year.