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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

 Apr 19, 2021
 #1
avatar+108 
0

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.

 

 

The beautiful thing about learning is that no one can take it away from you. ~ Hannah🌹🌹🌹

 Apr 19, 2021
 #3
avatar+113118 
+1

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

 

 Apr 19, 2021

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