Hamed has a standard score of 4 in his math class final exam that has an average mark of 23 and a standard deviation of 2.5 marks. What is Hamed's mark?The answer is 33 but how did we get it

What is the number 321,000,000 in scientific notation? also what is the number? ?

Me max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?