7. Sales (5 Thousands) (i) 20 10 0 Jan Feb Mar Apr May Month Copy and complete the table below to show the sales for EACH month. Month Sales in SThousands Jan Feb Mar 38 27 Apr May (3 marks) (ii) Between which TWO consecutive months was there the GREATEST decrease in sales? (1 mark) (iii) (iv) Calculate the mean monthly sales for the period January to May 2010. The TOTAL sales for the period January to June was $150 000. Calculate dollars, for the month of June. (3 marks) the sales. in (2 marks) (v) months. Comment on how the sales in June compared with the sales in the previous five (2 marks) Total 11 marks The data below are the lengths, to the nearest centimetre, of the right foot of the 25 students in a class. (a) 14 18 15 18 16 18 16 19 17 19 ខ្លួនជនន 20 20 21 22 22 22222 24 25 25 23 26 23 27 Copy and complete the following grouped frequency table for the data above. Length of Right Foot Frequency (cm) 14-16 17-19 20-22 8 5 26-28 2 (b) State the lower boundary of the class interval 14-16. (c) State the width of the class interval 20-22. (d) (e) 6 (s) ( 2 marks) ( 1 mark) ( 1 mark) would lie. A student's right foot measured 16.8 em. State the class interval in which this length ( 1 mark) A student was chosen at random from the group, and the length of his right foot was measured. Calculate the probability that the length was GREATER THAN or EQUAL ( 2 marks) to 20 cm State the modal length of a student's right foot. ( 1 mark) Calculate an estimate of the mean length of a student's right foot using the midpoints o the class intervals in (a) above. (3 marks)