Answer:
31 calls
Explanation:
This method of information dissemination forms a tree diagram with a common factor of 2 for each next day.
On Monday, Lori made a call.
By noon on Tuesday (the next day), two calls were made by the initial member.
By noon on Wednesday, four calls would be made by the two members.
By noon on Thursday, eight calls would be made.
By noon on Friday, sixteen calls would be made.
Therefore,
total calls made by Friday afternoon = 1 + 2 + 4 + 8 + 16
= 31