the marks obtainedby 10 students in a test are 24, 30, 26, 15, 22, 20, 12, 25, 21 and xand their mean is 21. Then what is the value of x.
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24+ 30+ 26+ 15+ 22+ 20+ 12+ 25 + 21 + x /2 = 21
195+x/2=21
195+x = 21*2
=42
195-42 = x
153 =x
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