कुछ प्राकृतिक परिघटनाएँ | CLASS 8 विज्ञान | 5 PM Class by Nishtha ma'am | L2 | Hindi Medium

The probability that a student selected at random from a class will pass in Hindi is 4/5 and the probability that he passes in Hindi and English is 1/2 . What is the probability that he will pass in English if it is known that he has passed in Hindi ?

In a class of 50 students, 23 speak English, 15 speak Hindi and 18 speak Punjabi. 3 speak only English and Hindi, 6 speak only Hindi and Punjabi and 6 speak only English and Punjabi. If 9 speak only English, then how many speak all the three? (a) 1 (b) 2 (c) 3 (d) 5

Complete the following activity by filing the boxes : Here, L = 90, N/2 = 45, cf = 30, f = 25 , h = class interval of the median class = square Median = L + [(N/2 - cf)/f] xx h …(Formula) = square+ (square-square)/25 xx 5 .....(Substituting the values) = square + square/5 = square + square = 93

12 PM Special Class | Class 11 - STRUCTURE OF ATOM || BOHR MODEL By Yakshu Ma'am

In a frequency distribution table with 12 classes, the class-width is 2.5 and the lowest class boundary is 8.1, then what is the upper class boundary of the highest class?

In class 12 there are 8 students. In class 11 there are 6 students .In class 10 there are 5 students . Total ways of selecting 10 students , such that there are at least 2 students from each class and at most 5 students from 11 students of Class 10 and 11 combined is 100k. Then find value of k

There are 5 brilliant students in class XI and 8 brilliant students in class XlIl.Each class has 50 students.The odds in favour of choosing the class XI are 2:3. One of the classes is chosen randomly and then a student is randomly selected.Find the probability of selecting a brilliant student.

Thirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows: 1 6 2 3 5 12 5 8 4 8 10 3 4 12 2 8 15 1 17 6 3 2 8 5 9 6 8 7 14 12 (i) Make a grouped frequency distribution table for this data, taking class width 5 and one of the class intervals as 5 - 10. (ii) How many children watched television for 15 or more hours a week?

The average weight of some students in a class was 58.4kg. When 5 students having the average weight 62.8 kg joined the class, the average weight of all the students in the class increased by 0.55 kg. The number of students initially in the class were: एक कक्षा में कुछ छात्रों का औसत वज़न 58.4 किलो ग्राम था | जब 62.8 किलो ग्राम औसत वज़न वाले 5 छात्र इस कक्षा में आते हैं, तो कक्षा के सभी छात्रों का औसत वज़न 0.55 किलो ग्राम बढ़ जाता है | आरंभ में कक्षा में छात्रों की संख्या कितनी थी ?