Cho mặt bậc hai
z=\sqrt(x^(2)+y^(2))

. Đây là mặt gì?

The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?

To decrease an amount by 16% what single multiplier would you use

Out of 50 students surveyed, 16 have a dog. based on these results, predict how many of the 280 students in the school have a dog.