Ayuda por favor [0,3 ∞ °] necesito determinar la desigualdad que representa el intervalo.

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

True or false? a circle could be circumscribed about the quadrilateral below.

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?