Kevin received 20 text messages on his phone and 12 were from his mother. What percent were NOT from his mother?

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population,find the population standard deviation, o.79828588912497

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

Here is my question! 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?