Model test Paper Class 8 | Jharkhand board|

Model test paper class 9

Factories class 8

Two third of the students of a class are boys and rest are girls . It is known that the probability of a girl getting a first division in Board examination is 0.4 and a boy getting first division is 0.35. Find the probability that a students chosen at random will get first division in Board examination.

An airline agrees to charter planes for a group. The group needs at least 160 first class seats and at least 300 tourist class seats. The airline must use at least two of its model 314 planes which have 20 first class and 30 tourist class seats. The airline will also use some of its model 535 planes which have 20 first class seats and 60 tourist class seats. each flifgt of a model 314 costs rs 100,000. Each flight of a model 535 cost Rs. 150,000. How many of each type f plane should be used to minimize the flight cost? Formulate this as a LPP.

The mileage (km per litre) of 50 cars of the same model was tested by a manufacture and details are tabulated as given below Find the mean mileage. The manufacture claimed that the mileage of the model was 16 kmL. Do you agree with this claim?

What change will you observe if you test soap with litmus paper (red and blue)?

In a series of tests, A appeared for 8 tests Each test was marked out of 30 and averages 25. However, while checking his files, A could only find 7 of the 8 tests. For these he scored 29 26, 18 ,20, 27, 24 and 29. Determine how many marks he scored for the eighth test.

The frequency chart shows test scores for a certain class. The total number of student is 31. If a student in the class was picked at random , what is the probability that the student's score was below 71 ?

In a group of 40 students , 23 take the AP Psycholgy class , 18 take the AP Calculas class, and 8 take both classes . What is the probability that a student takes AP Psychology or AP Calculus ?

Use the table given below to find : (a) The actual class limits of the fourth class. (b) The class boundaries of the sixth class. (c) The class mark of the third class. (d) The upper and lower limits of the fifth class. (e) The size of the third class. {:("Class interval","Frequency"),(30-34,7),(35-39,10),(40-44,12),(45-49,13),(50-54,8),(55-59,4):}