{"id":7025,"date":"2021-10-22T15:36:39","date_gmt":"2021-10-22T10:06:39","guid":{"rendered":"https:\/\/mathemerize.com\/?p=7025"},"modified":"2021-10-25T09:15:16","modified_gmt":"2021-10-25T03:45:16","slug":"in-a-class-of-100-students-there-are-70-boys-whose-average-marks-in-a-subject-are-75-if-the-average-marks-of-the-complete-class-is-72-then-what-is-the-average-of-the-girls","status":"publish","type":"post","link":"https:\/\/mathemerize.com\/in-a-class-of-100-students-there-are-70-boys-whose-average-marks-in-a-subject-are-75-if-the-average-marks-of-the-complete-class-is-72-then-what-is-the-average-of-the-girls\/","title":{"rendered":"In a class of 100 students. there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72, then what is the average of the girls?"},"content":{"rendered":"

Solution :<\/h2>\n

Since, total number of students = 100<\/p>\n

and number of boys = 70<\/p>\n

\\(\\therefore\\) number of girls = (100 – 70) = 30<\/p>\n

Now, the total marks of 100 students = 100*72 = 7200<\/p>\n

And total marks of 70 boys = 70*75 = 5250<\/p>\n

Total marks of 30 girls = 7250 – 5250<\/p>\n

\\(\\therefore\\)\u00a0 Average marks of 30 girls = \\(1950\\over 30\\) = 65<\/p>\n

\n

Similar Questions<\/h3>\n

The mean and variance of a random variable X having a binomial distribution are 4 and 2 respectively, then P(X = 1) is<\/a><\/p>\n

The median of a set of 9 distinct observations is 20.5. If each of the largest 4 observation of the set is increased by 2, then the median of the new is<\/a><\/p>\n

The mean and the variance of a binomial distribution are 4 and 2, respectively. Then, the probability of 2 success is<\/a><\/p>\n

In a series of 2n observations, half of them equals a and remaining half equal -a. If the standard deviation of the observation is 2, then |a| equal to<\/a><\/p>\n

A random variable X has poisson distribution with mean 2. Then, P(X > 1.5) equal to<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Solution : Since, total number of students = 100 and number of boys = 70 \\(\\therefore\\) number of girls = (100 – 70) = 30 Now, the total marks of 100 students = 100*72 = 7200 And total marks of 70 boys = 70*75 = 5250 Total marks of 30 girls = 7250 – 5250 …<\/p>\n

In a class of 100 students. there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72, then what is the average of the girls?<\/span> Read More »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-global-header-display":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[43,58],"tags":[],"yoast_head":"\nIn a class of 100 students. there are 70 boys whose average marks in a subject are 75. 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