Last year, a poll of 1,000 voters conducted by the staff of senator chun found that 522 people approved of the job the senator was doing. this year, a new poll of 1,000 voters shows that 423 people approve of the senator’s performance. find the percent of change in the number of voters who approve of the senator’s performance, and identify it as an increase or decrease.

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?