Question
Raj measures the height, h cm, of 70 plants.
The table shows the information.
Calculate an estimate of the mean height of the plants.
……………………… cm
Answer/Explanation
Ans:
44.1 or 44.07…
Question
Cheryl recorded the midday temperatures in Seoul for one week in January.
(a) Write down the mode.
Answer/Explanation
Ans: -3 °C
(b) On how many days was the temperature lower than the mode?
Answer/Explanation
Ans: 4
Question
Jim scores the following marks in 8 tests.
7 8 8 y 6 9 10 5
His mean mark is 7.5 .
Calculate the value of y.
Answer/Explanation
Ans: 7 nfww
Question
The box-and-whisker plot gives information about the heights, in centimetres, of some plants.
(a) Write down the median.
…………………………………….. cm
(b) Find
(i) the range,
…………………………………….. cm
(ii) the interquartile range.
…………………………………….. cm
Answer/Explanation
(a)11.5
(b)(i)12
(ii)8.5
Question
The table shows the marks scored by 40 students in a test.
Calculate the mean mark.
…………………….
Answer/Explanation
7.2
Question
Some students were asked how many books they each had in their school bags.
The table shows some of this information.
The mean number of books is 7.6 .
Calculate the value of x.
x = ………………………………………….
Answer/Explanation
13
Question
The number of passengers on a bus is recorded each day for 14 days.
15 18 22 17 35 38 24
19 19 24 25 31 36 29
(a) Complete the stem-and-leaf diagram.
(b) Find the median.
………………………………………….
Answer/Explanation
(a)
(b)24