Find the measure of angle y for the kite showing below.

In the kite two of the angles like W and Y are congruent. m∠W =m∠Y

Also sum of all interior angles in the quadrilateral =360⁰.

So, we can write

87 +38 + 2*m∠Y= 360

2*m∠Y = 360-87-38

2*m∠Y= 235

m∠Y=235/2=117.5⁰

d. The population standard deviation is known.

Step-by-step explanation:

T-distribution or Z-distribution, which to use?

If we have the population standard deviation is known, we use the z-distribution.

Otherwise, if we only have the standard deviation for the sample, we use the t-distribution.

Which of the following is not appropriate to use the t-confidence interval for

When the population standard deviation is known, so letter d.