Model test Paper class 8 | Jharkhand board

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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 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 ?

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.

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):}

The starting value of the model class of a distribution is 20. The frequency of the model class is 18. The frequencies of the classes preceeding and succeeding are 8,10 and the width of the model class is 5, then mode is

Rekha has to cover a board in her class with a piece of red paper. The board is rectangular in shape. The length of the board is 7 units more than thrice its breadth. Answer the following. a. If the breadth is p, find the rule for finding the area of the piece of red paper that Rekha needs to cover the board with. b. Use the rule to find the required area of the paper, given that the breadth of the board is 40 cm.