1. The number of violent crimes committed in a day possesses a normal distribution with a mean of 3.8 crimes per day and a standard deviation of 2 crimes per day. A random sample of 15 days was observed, and the mean number of crimes for the sample was calculated. Would it be appropriate to use the normal distribution to find the probabilities involving the mean number of violent crimes per day?

the probability is 0

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.