Find the cutoff score for top 20% if X~N(115, 10)
It is given that:
The standardized value of X is:
Let the cutoff score for top 20% be C.
Hence, the value of C can be obtained as:
The z-value is obtained using the Excel function, NORMSINV, with the value 0.80.
Therefore, the cutoff score for top 20% if is 117.66.
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