Ex In a cricket match, a batswoman hits a boundary 6 times out of 30 balls she plays. Find the probability that she did not hit a boundary. In a particular section of class IX, 40 students were asked about the month of their birth and the following graph was prepared for the data so obtained.
Find the probability that a student of the class was born in August. Three coins are tossed simultaneously times with the following frequencies of different outcomes. If the three coins are simultaneously tossed again, compute the probability of 2 heads coming up. An organisation selected families at random and surveyed them to determine a relationship between income level and the number of vehicles in a family. The information gathered is listed in the table below. Suppose a family is chosen.
A teacher wanted to analyse the performance of two sections of students in a mathematics test of marks. Looking at their performances, she found that a few students got under 20 marks and a few got 70 marks or above. So she decided to group them into intervals of varying sizes as follows 0 � 20, 20 � 30, �, 60 � 70, 70 � To know the opinion of the students about the subject statistics, a survey of students was conducted.
The data is recorded in the following table Find the probability that a student chosen at random i likes statistics, ii does not like it.
The distance in km of 40 engineers from their residence to their place of work were found as follows What is the empirical probability that an engineer lives i less than 7 km from her place of work?
Activity: Note the frequency of two-wheelers, three-wheelers and four-wheelers going past during a time interval, in front of your school gate. Find the probability that any one vehicle out of the total vehicles you have observed is a two-wheeler? Solution: It is an activity. Students can do it themselves. Activity : Ask all the students in your class to write a 3-digit number. Choose any student from the room at random. Remember that a number is divisible by Byjus Maths Class 7 Chapter 11 Answers 3, if the sum of its digit is divisible by 3.
Solution: A class room activity for students. Eleven bags of wheat flour, each marked 5 kg, actually contained the following weights of flour in kg 4. A study was conducted to find out the concentration of sulphur dioxide in the air in parts per million ppm of a certain city. The data obtained for 30 days is as follows You were asked to prepare a frequency distribution table, regarding the concentration of sulphur dioxide in the air in parts per million of a certain city for 30 days.
Using this table, find the probability of the concentration of sulphur dioxide in the interval 0. Use this table to determine the probability that a student of this class, selected at random, has blood group AB. RD Sharma Class 12 Solutions. Watch Youtube Videos.
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