Answer:
11
Step-by-step explanation:
sum of the values- 28
mean 7.8
number of values 5
(28+x)/5=7.8
28+x=5(7.8)
28+x=39
x=39-28
x=11
checking
8+4+11+5+11=39
39÷5=7.8
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Answers & Comments
Answer:
11
Step-by-step explanation:
sum of the values- 28
mean 7.8
number of values 5
(28+x)/5=7.8
28+x=5(7.8)
28+x=39
x=39-28
x=11
checking
8+4+11+5+11=39
39÷5=7.8