Judging the humorousness of "lawyer" jokes.Stillman, Baumeister, and DeWall (2007) conducted a study where participants listened to a variety of jokes. To determine how funny the jokes were, the researchers asked a group of 86 undergraduates to rate the jokes on a scale from 1 (very unfunny) to 21 (very funny). Participants rated a "lawyer joke" as one of the funniest jokes, with a rating of 14.48 4.38 (MSD).

Assuming that these data are normally distributed, How many of the 86 undergraduates gave the joke a rating of at least 10?

I'm not quite understanding how to get the answer 72.76. Please explain step by step how to get the answer so I can walk through the problem.

thank you.