Q-3|| exercise 9.2 ||Std 8 maths ch 9|| standard 8 maths ch 9 in gujarati|| Child Guruji

9.2 xx 8.8 = 72.96

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.

If 7 xx 3 -: 8 = 80 , then 8-: 2 xx 9 = ?

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