Một cậu bé chơi trò chơi ném bóng vào rổ ném lần lượt cho tới khi có bóng trúng hoặc hết 4 quả bóng thì dừng. Gọi X là số quả bóng mà cậu bé đã ném.

Really need on these. i have no idea what to do

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?

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?