for the standard normal curve, find the z-score that corresponds to the 7th decile.

Answer; 

Using Z-table:

z-score =  0.52.

Using technology as Excel:

z-score = 0.5244.

Step by Step Explanation

The z-score for the seventh decile is what we are looking for in this case.

According to math, P(Z z) = 0.70

Z-table use:

Given that the probability closest to 0.7000 is 0.6985

0.52 is the result for 0.6985.

The answer is therefore 0.52

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