There are 200 students in a sample. How many of these students will have scores that fall under the score of 41? Mean is 45, standard dev. is 4.

Question

There are 200 students in a sample.  How many of these students will have scores that fall under the score of 41?  Mean is 45, standard dev. is 4.

PsyDAG · Answer

Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score. Multiply that proportion by 200.