A normal distribution has a mean of 13 and a standard deviation of 4. What percent of values are from 13 to 21​?

The graph shows the distance kerri drives on a trip. what is kerri's speed?

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?

How can you check that you have correctly converted frequencies to relative frequencies?