Is it considered "talfīq" (impermissible commingling of different schools of thought) for a layman to adopt the view of the majority of scholars in fatwas? And should the most cautious and sound opinion be adopted if there is no majority opinion on a particular issue?

There is no blame upon the layman who is unable to weigh different opinions if he adopts the view of the majority in disputed matters, nor is this considered eclecticism, because the opinion of the majority carries a certain authority that necessitates careful consideration before contradicting it. If the layman does not find a majority opinion, there is no blame upon him for following the opinion given to him by the scholar he imitates. It is obligatory for the layman to imitate a scholar whom he trusts among the people of knowledge.