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HELP ME PLEASE i am not under standing the problem the instructions are on the attchment

HELP ME PLEASE I Am Not Under Standing The Problem The Instructions Are On The Attchment class=

Sagot :

Answer:

10

Step-by-step explanation:

Mean = sum of all data : number of data

15 = (17+15+21+12+x) : 5

75 = 65 + x

x = 10