Saved In a group of 10 mattress customers, 5 reported sleeping 8 hours the previous night. 2 customers slept for 7 hours, 1 slept for 10 hours, and 2 only slept for 5 hours. On average, how many hours did these 10 customers sleep last night? Question 19 options: a) 8.0 hours b) 7.0 hours c) 7.8 hours d) 7.4 hours