6. At the right is a cumulative relative frequency graph for the amount spent on a sibling's birthday
present for a group 80 people.
a) Estimate the median and interquartile range of
the amount of money spent on a gift. Draw lines
on the graph to show how you arrived at your answer.
Show work.

To communicate effectively, you must understand the various factors that can affect the exchange of messages and to use communication techniques that are most appropriate for each individual situation.

Psychologists often talk of the magical number "7" - so it is generally assumed that we can keep 7 (more or less, so 5-9 is the correct answer) items in our short term memory - we know this as a result of many experiments.

we can increase this by chunking, so for example "7 8 9 5 3" is harder to remember than "78 95 3" - try it yourself!

the answer is a)