Answer: The mean weekly allowance is<u> 3.5</u> dollars
Step-by-step explanation:
Given: Number of students receive no amount =7
Number of students receive $3=5
Then, total amount 5 students receive = 
Number of students receive $5=7
Then, total amount 7 students receive = 
Number of students receive $6=3
Then, total amount 3 students receive = 
Number of students receive $8=2
Then, total amount 2 students receive = 
Now, the total amount all students receive=
The total students = 
Now, Mean=
Hence, The mean weekly allowance is <u>3.5</u> dollars.