Q-3|| exercise 9.3 ||Std 8 maths ch 9|| standard 8 maths ch 9 in gujarati|| Child Guruji

The standard deviation of data 6,5,9,13,12,8 and 10 is

In a monthly test,the teacher decides that there will be three questions,one from each of Exercises 7,8 and 9 of the text book.If there are 12 questions in Exercise 7,18 in Exercise 8 and 9 in Exercise 9, in how many ways can three questions be selected?

Find the variance and standard deviation of the scores 7 , 8 , 9 , 10 and 16.

Suppose a child’s status in Math is equivalent to 9 years, in Science 10 years, in English 11 years and Hindi 12 years then his educational age is

CBSE Class 9 Ultimate Strategy to Score 100 in Maths

If p:q=3:4 and q:r=8:9 then p:r is

In a school, students must take at least one of these subjects: Maths, Physics or Chemistry. In a group of 50 students, 7 take all three subjects. 9 take Physics and Chemistry only, 8 take Maths and Physics only and 5 take Maths and Chemistry only. Of these 50 students, x take Maths only, x take Physics only and x + 3 take Chemistry only. Draw Venn diagram, find x, and hence find the number taking Maths.

Study the following arrangement carefully and answer the questions given below: 6 7 8 9 9 8 7 9 7 7 8 9 7 8 7 6 9 6 8 9 7 7 9 8 9 7 6 8 8 7 How many such seven are there in the given series each of which is immediately preceded by 9 and also immediately followed by 8? 1) None 2 ) One 3)Two 4)Three 5)More than three

In the following number series how many 9's are there which are immediately preceded by a pair of numbers whose product is more than the product of the pair of numbers immediately following 9 ? 8 7 9 9 6 8 4 5 9 3 8 4 9 2 5 1 9 2 2 6 9 4 3 9 2 5 8 1) 4 2) 3 3) 6 4) 5 5) None of these

Study the following arrangement carefully and answer the questions given below: 6 7 8 9 9 8 7 9 7 7 8 9 7 8 7 6 9 6 8 9 7 7 9 8 9 7 6 8 8 7 How many such odd numbers are there in the given series each of which is immediately preceded by an even number? 1) Five 2 ) Seven 3)Nine 4)Eleven 5)None of these