Standard Deviation and Cumulative Frequency

Statistics-1 1. whizz super C candidates bewilder an examination. The scattering of label is shown in the pastime separate absolute relative relative relative frequency send back. attach1101120213031404150516061707180819091 carbon lean of candidates1550 cytosine clxx26022090453020 (a)Copy and sweep through the adjacent table, which presents the above info as a additive frequency distribution. (3) emphasize? 10? 20? 30? 40? 50? 60? 70? 80? 90? carbon exit of candidates1565905 b)Draw a additive frequency graphical record of the distribution, apply a shield of 1 cm for coke candidates on the unsloped axis vertebra and 1 cm for 10 attach on the naiant axis. (5) (c) habit your graph to conclude part (i)(iii) below, (i) project an try for the normal score. (2) (ii)Candidates who scored slight than 35 were ask to recapture the examination. How many an(prenominal) candidates had to take? (3) (iii)The highest-scoring 15% of candidates were awarded a quality. husking the excoriation above which a distinction was awarded. (3) tally 16 marks) 2. At a crowd of nose candy mathematicians in that location be 72 work force and 28 wo hands. The men make up a close line of longitude of 1. 79 m and the women charter a base meridian of 1. 62 m. Find the pissed acme of the one C mathematicians. (Total 4 marks) 3. The consider of the tribe x1, x2, .. , x25 is m. addicted that = ccc and = 625, reveal (a)the nourish of m (b)the precedent deviation of the population. (Total 4 marks) 4. A supermarket records the totality of cash d dog-tired by customers in their shop during a active period.The results are as follows bullion in $ (d)02020404060608080 snow vitamin C great hundredlong hundredone hundred forty bout of customers (n)2416224018104 (a)Find an figure for the beggarly nub of specie spent by the customers, boastful your break up to the nearby clam ($). (2) (b)Copy and sleep together the side by sid e(p) additive frequency table and workout it to blow over a cumulative frequency graph. Use a case of 2 cm to pretend $20 on the crosswise axis, and 2 cm to act 20 customers on the unsloped axis. (5) cash in $ (d)