the mean of 5 numbers is 30 if one number is excluded then it becomes 28 the excluded number is
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the mean of 5 numbers is 30 if one number is excluded then it becomes 28 the excluded number is
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x / 5 = 30
x = 150
Now, one no. is removed.
Let removed no. be y.
150 - y / 4 = 28(here no. of observation become 4)
150 - y = 112
y = 38
So your answer is 38.
new mean = (150-x)/4
28=(150-x)/4
112=150-x
x=150-112
x=38