Answer:
Let the 5th number be x.
We know that:
[tex]\sf Average = \dfrac{Sum \ of \ numbers}{Number \ of \ observations}[/tex]
- Sum = 1+2+3+4+x = 10 + x
- Number of observations = 5.
- Average is already given, i.e., 100.
Substitute.
[tex]\sf 100 = \dfrac{10+x}{5}[/tex]
[tex]\sf x=500-10[/tex]
[tex]\boxed{\sf{\red{x=490}}}[/tex]
The 5th number is 490
⊱ ────── ✯ ────── ⊰
#Carryonlearning :D
