Answer:
2.1
Step-by-step explanation:
Use the equation
Sum of elements = average x number of elements
sum = (6)(4)
sum = 24
Add up the numbers we know: 3.4 + 10.7 + 7.8 = 21.9
24 - 21.9 = 2.1
This means the fourth number is 2.1
Answer:

Step-by-step explanation:




Hope this helps!
Answer: B
Step-by-step explanation:
Grade must be greater than or equal to 88
Sorry if i am wrong but it's 40