Isobel gives a puzzle to some people and records how long they take to solve it. Some of her results are summarised in the histogram. Four people took 20 minutes or less to solve it. Work out the percentage of the people who took 30 minutes or more.

What is the rotational symmetry of a wheel

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?

Ahypothesis is: a the average squared deviations about the mean of a distribution of values b) an empirically testable statement that is an unproven supposition developed in order to explain phenomena a statement that asserts the status quo; that is, any change from what has been c) thought to be true is due to random sampling order da statement that is the opposite of the null hypothesis e) the error made by rejecting the null hypothesis when it is true