Agroup of 625 students has a mean age of 15.8 years with a standard deviation of 0.6 years. the ages are normally distributed. how many students are younger than 16.2 years? express answer to the nearest student.

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?