Kelsie works at a bicycle shop as a salesperson. she records the number of bicycles she sells daily. here is the probability distribution of b = the number of bicycles kelsie sells on a randomly selected day, and t the time she spends filling out daily sales reports. 2 b = # of bicycles sold t = time (minutes) probability 40 20 10 0.05 0.15 0.50 0.30

a) calculate e(b)
b) calculate the mean time she spends filling out daily reports.
c) calculate the standard deviation for both random variables.

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.

a rotation about point l

step-by-step explanation:

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