Aset of data items is normally distributed with a mean of 300 and a standard deviation of 10. find the data item in this distribution that corresponds to the given z-score. z equals 2.5

What is the difference between the points (4, 7) and (4, -5)? a. 0 units b. 2 units c. 4 units d. 12 units

How to do this , and can some one explain

Aflower has 26 chromosomes. to create a new flower, how many chromosomes would a sperm cell have? what is this process called? part 2: within a flower cell that has 26 chromosomes, how many chromosomes would a cell that is created within the stem of a flower as it grows, have? what is this process called?