Use technology or a z-distribution table to find the indicated area. The scores on a standardized exam are normally distributed with a mean of 400 and a standard deviation of 50. Approximately 40% of the scores are greater than which score?
A. 370
B. 387
C. 413
D. 430
Don't know much about this, but here's my best shot. On the z score table, 40% corresponds roughly with a z-score of ... z score = score - mean. ______. std deviation ... 50 (.25) = score - 400 add 400 to both sides ... 412.5 = score ≈ 413.
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Here is a simple little site that I like.
Put the numbers in and it will spit our your answer.
https://davidmlane.com/hyperstat/z_table.html