Ex – 13.1 Que No. 4 Q.4) Thirty women were examined in a hospital by a doctor and the number of heartbeats perminute were recorded and summarised as follows. Find the mean heartbeats per minutefor these women, choosing a suitable method. Solution:-
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Ex – 13.1 Que No. 3 Q.3) The following distribution shows the daily pocket allowance of children of a locality. The mean pocket allowance is Rs 18. Find the missing frequency f. Solution:-
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Ex – 13.1 Que No. 2 Q.2) Consider the following distribution of daily wages of 50 workers of a factory. Find the mean daily wages of the workers of the factory by using an appropriate method. Solution:-
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Ex – 13.1 Que No. 1 Q.1) A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in 20 houses in a locality. Find the mean number of plants per house. Which method did you use
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Ex – 11.1 Que No. 14 Q.14) Tick the correct answer in the following :Area of a sector of angle p (in degrees) of a circlewith radius R is
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Ex – 11.1 Que No. 13 Q.13) A round table cover has six equal designs as shown in Fig. 11.11. If the radius of the cover is28 cm, find the cost of making the designs at therate of 0.35 per cm2. (Use 3 = 1.7) Solution:-
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Ex – 11.1 Que No. 12 Q.12) To warn ships for underwater rocks, a lighthouse spreads a red coloured light over a sector of angle 80° to a distance of 16.5 km. Find the area of the sea over which the ships are warned. (Use π = 3.14) Solution:-
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Ex – 11.1 Que No. 11 Q.11) A car has two wipers which do not overlap. Each wiper has a blade of length 25 cm sweeping through an angle of 115°. Find the total area cleaned at each sweep of the blades. Solution:-
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Ex – 11.1 Que No. 10 Q.10) An umbrella has 8 ribs which are equally spaced (see Fig. 11.10). Assuming umbrella to be a flat circle of radius 45 cm, find the area between the two consecutive ribs of the umbrella. Solution:-
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Ex – 11.1 Que No. 9 Q.9) A brooch is made with silver wire in the formof a circle with diameter 35 mm. The wire is alsoused in making 5 diameters which divide the circle into 10 equal sectors as shown in Fig. 11.9. Find : Solution:-
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