Adigital scale reports a 10 kg weight as weighing 8.975 kg

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?

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

With finding limits of multi variable !