Mode: The class which have highest frequency.In this case, class interval 30−35 is the modal class.Now,Lower limit of modal class, l=30,h=5,f1​,=10,f0​=9,f2​=3We know that,Mode =l+(2f1​−f0​−f2​f1​−f0​​)×h=30+(2(10)−9−310−9​)×5=30+(20−121​)5=30+81​×5Mode =30.625≡30.6for mean,Mean, xˉ=∑fi​∑fi​ui​​xˉ=351022.5​=29.2Therefore, Most states/U.T. have a student teacher ratio of 30.6 and on an average, the ratio is 29.2.