The population of two cities M and N are in the ratio of 7:57:5 . If the population of city M decreases by 40%40% , while that of city N increases by 20%20% find the ratio of their new populations.
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it is claimed by a racer bike manufacturing company that the race bikes are driven on a average of more than 12,000 kilometres on yearly basis .To the test the company's claim 100 randomly drawn racer bike owners are asked to maintain a record of total distance they travel. Will you favour this companys claim if the randomly selected sample exibit an average of 13,200 kilometres and a standard deviation of 3900 kilometres? Use P value to conclude your answervwith 5% level of significance
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