Question 1197776
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Answer:  k = 0.21


Explanation:


There are many free online Z score calculators to use. 
I recommend this one as it offers a diagram 
<a href = "https://davidmlane.com/normal.html">https://davidmlane.com/normal.html</a>
Click on the radio button "Value from an area"
Then type 0.17 into the "area" box. Leave the mean and SD as 0 and 1 respectively.


Then click on the "between" radio button to have "-0.214 and 0.214" show up.
You might have to click "recalculate".


This tells us that P(-0.214 < z < 0.214) = 0.17 approximately


When rounding to two decimal places, we write
P(-0.21 < z < 0.21) = 0.17
which shows k = 0.21


*[illustration Screenshot_106.png]
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