The rules of a contest say there is a 1 out of 20 chance of winning a prize. 420 people enter the contest. Predict how many people will win a prize.

On the first of each month, shelly runs a 5k race. she keeps track of her times to track her progress. her time in minutes is recorded in the table: jan 40.55 july 35.38 feb 41.51 aug 37.48 mar 42.01 sept 40.87 apr 38.76 oct 48.32 may 36.32 nov 41.59 june 34.28 dec 42.71 determine the difference between the mean of the data, including the outlier and excluding the outlier. round to the hundredths place. 39.98 39.22 0.76 1.21

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²