Factories class 8

Life of bulbs produced by two factories A and B are given below: Length of life (in hours): 550-650 650-750 750-850 850-950 950-1050 Factory A: (Number of bulbs) 10 22 52 20 16 Factory B(Number of bulbs) 8 60 24 16 12

Life of bulbs produced by two factories A and B are given below: Length of life (in hours):, 550-650, 650-750, 750-850, 850-950, 950-1050 Factory A: (Number of bulbs), 10, 22, 52, 20, 16 Factory B(Number of bulbs), 8, 60, 24, 16, 12 The bulbs of which factory are more consistent from the point of view of length of life?

The following data gives the weights of 30 persons (in kg) 70.0,69.4,49.4,64.5,59.4,72.4,47.5,48.8,62.3,64.2,66.8,70.3,71.3,56.3,52.7,66.6,59.9,64.7,44.6,60.3,50.3,54.3,62.3,56.3,45.0,45.7,49.8,60.5,67.8,50.1, (i) Construct a frequency distribution such that the last class is 72-76. (ii) State the upper class limits of last three class intervals. (iii) State the maximum weight that can be included in the fourth class interval. (iv) State the class mark of each of the classes. (v) Find the range of the given weights. (vi) If 60kg is the weight of a person then in which class interval, it will be taken.

In two factories A and B engaged in the same industrial area, the average weekly wages (in rupees) and the standard deviations are as follows: (i) Which factory, A or B, pays out a larger amount as weekly wages? (ii) Which factory, A or B, has greater variability in individual wages?

In Class XI of a certain school, there are 30 students in a Mathematics class and 20 students in Biolog class. Find the number of students which are in Mathematics class or in Biology class in the following cases: (i) Two classes are conducted at the same time. (ii) Two classes are condcuted at different time and 5 students study both the subject

Two factories are sounding their sirens at 800 Hz. A man goes from one factory to the other at a speed of 2 m/s. The velocity of sound is 320 m/s. The number of beats heard by the person is 1 s will be

In a certain mathematics class, the part of the class that are members of the math club is 50% of the rest of that class. The total number of math club members in this class is what percent of the entire class?

Std 8 maths ch 5 || standard 8 maths chapter 5 in gujarati||class 8 maths ch 5||ભાગ=૪|| Child Guruji

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):}