HI there. I'm very bad at calculation i need help from the tutor to solve and explain with the steps.

subject ; quantitative methods

Length (cm) Frequency

20 - 24 9

25 - 29 19

30 - 34 30

35 - 39 31

40 - 44 8

45 - 49 2

50 - 54 1

The table above shows the distribution of length of 100 glass rods in a laboratory. Construct a relevant table for calculate the value below. (3 marks)

a. The mode (2 marks)

b. The mean (2 marks)

c. Standard deviation (2 marks)

d. Draw a cumulative frequency curve (using graph paper). (3 marks)

e. Use your curve to estimate (i) the median (1 marks) (ii) The frequency of the glass rods with length in between 40cm and 43cm. (2 marks)