A telecommunications company commissioned a study to investigate the amount of time that people spend on phone calls. The study that found that the length of time that people spend on a phone call is approximately normally distributed with a mean of 519 seconds and a standard deviation of 104.7 seconds. Calculate the standardized value (z) for a time of 630 seconds. Give your answer to 2 decimal places

Plzzz i beg u so much asaaaap ! what is the slope of this line? enter your answer in the box.

Assume that 1400 births are randomly selected and 1378 of the births are girls. use subjective judgment to describe the number of girls as significantly high, significantly low, or neither significantly low nor significantly high. choose the correct answer below. a. the number of girls is neither significantly low nor significantly high. b. the number of girls is significantly high. c. the number of girls is significantly low. d. it is impossible to make a judgment with the given information.

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?