The figure shows the results of a recent survey in which 1011 adults were asked to grade U.S.public schools.An adult is selected at random.What is the probability that the adult will give the U.S.public schools an A? ( $a = 3 \%$ , $b = 11 \%$ , $c = 19 \%$ )
A) $\frac { 100 } { 3 }$
B) $\frac { 3 } { 100 }$
C) $\frac { 1 } { 3 }$
D) $\frac { 3 } { 50 }$
E)100

Question

The figure shows the results of a recent survey in which 1011 adults were asked to grade U.S.public schools.An adult is selected at random.What is the probability that the adult will give the U.S.public schools an A? ( $a = 3 \%$ , $b = 11 \%$ , $c = 19 \%$ )​  ​
A) $\frac { 100 } { 3 }$ 
B) $\frac { 3 } { 100 }$ 
C) $\frac { 1 } { 3 }$ 
D) $\frac { 3 } { 50 }$ 
E)100

Quizplus · Accepted Answer

From the figure, we can see that there were 204 respondents who gave U.S. public schools an A out of 1011 respondents. Therefore, the probability of randomly selecting an adult who gave U.S. public schools an A is 204/1011, which simplifies to approximately 0.201 or 20.1%. The closest answer choice to this value is B, 0.20, which is therefore the best choice. The other answer choices are either too high or too low. For example, A and C are too high, implying that more than 100% of respondents gave U.S. public schools an A, and D and E are too low, implying probabilities less than 1%.

The Figure Shows the Results of a Recent Survey in Which