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(1) A witness testifying as an expert may base his opinions or inferences on matters perceived by him or known to him because of his expertise or on matters assumed by him to be true for the purpose of giving his opinion or inference.

(2) The matters on which a witness testifying as an expert bases his opinion or inference need not be admissible in evidence.

(3) The matters on which a witness testifying as an expert bases his opinion or inference need not be disclosed before the witness states his opinion or inference, unless the court in its discretion determines otherwise, but he may be examined by any party concerning the basis for his opinion or inference and he shall then disclose that basis.