The mean speed of a sample of vehicles along a stretch of highway is 69
miles per hour, with a standard deviation of 4 miles per hour. estimate the percent of vehicles whose speeds are between 65 miles per hour and 73 miles per hour. (assume the data set has a bell-shaped distribution.)
approximately what % of vehicles travel between 65 miles per hour and 73
miles per hour.

d

step-by-step explanation:

40 minutes

step-by-step explanation:

add the time and multiply by 2

21

step-by-step explanation:

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.