Statistics — practice questions, page 5
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Weekly study hours of 25 students: 0–5 hours – 3 students, 5–10 – 8, 10–15 – 9, 15–20 – 5. What…The histogram shows the weights of 50 tea packets checked at a packing unit in Assam. Which class…Daily pocket money of 30 children: ₹10–20 – 5 children, ₹20–30 – 12, ₹30–40 – 8, ₹40–50 – 5. What…The less-than ogive shows the ages of 60 workers at a textile mill in Surat. How many workers are…A cyclist rides from Agra to a nearby village at 12 km/h and returns along the same road at 18…A wholesaler in Ratnagiri received 40 boxes of mangoes averaging 6.2 kg and 60 boxes averaging 5.7…The bar chart shows the trees planted by five schools in Dehradun during Van Mahotsav; the bar for…Twenty observations have a mean of 15. Each of the first 10 is increased by 3 and each of the…What is the median of the first 25 odd natural numbers?Nine observations have a mean of 21. Every observation is increased by the same percentage and the…The less-than ogive shows the marks of 80 students in a scholarship test. Using the grouped-data…Ages of 50 members of a yoga club in Rishikesh: 5–15 years – 4, 15–25 – 11, 25–35 – 15, 35–45 –…Heights of 60 saplings in a nursery: 100–110 cm – 7, 110–120 – 13, 120–130 – 21, 130–140 – 15,…Three batches at a coaching centre had pass rates of 80% (40 students), 65% (60 students) and 90%…A shop's monthly sales (₹ lakh) for six months were 12, 15, 18, 14, 20 and 23. What is the third…A car covers three equal stretches of a highway at 30 km/h, 40 km/h and 60 km/h. What is its…Four numbers have a mean of 25. When a fifth number is included, the mean goes up by 20%. What is…Students in sections A, B and C are in the ratio 2 : 3 : 5, and their mean marks are 60, 70 and…The average age of an 8-member committee is 40 years. A member aged 55 retires and is replaced by…Two positive numbers have an arithmetic mean of 10 and a harmonic mean of 6.4. What is their…Marks of 50 students: 0 or more – 50, 10 or more – 46, 20 or more – 38, 30 or more – 24, 40 or…A company's sales grew by 20% in the first year and by 80% in the second. What was the average…Classes 0–10, 10–30, 30–60 and 60–100 (unequal widths) have frequencies 5, 15, 12 and 8. What is…A family in Kochi spent on average ₹22,000 a month for the first 4 months of a year, ₹24,500 a…A grain trader spends ₹600 on wheat at ₹20 per kg, another ₹600 at ₹25 per kg and another ₹600 at…
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