In a certain city within Florida, the IQ scores of its citizens follow a normal distribution with a mean of 85 and a standard deviation of 10. (a) What percentage of citizens have an IQ score that falls between 80 and 100?

(b) 20% of the city's residents are above what IQ score?

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c. (3,2,6) is the answer.

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.