Billy invests £800 for 5 years in a savings account. By the end of the 5 years he has received a total of £96 simple interest.

Work out the annual rate of simple interest?

What is the base of 1/9 to the power of 2

How do you solve a question like this?

Now 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.