2. Find the mean of first five whole numbers.
3. The ages in years of 10 people are 32, 41, 28, 54, 35, 26, 23, 33, 38, 40. Find
of the people.
4. The marks obtained out of 100 by a group of students in mathematics are &
39, 48, 56, 95, 81 and 75. Find the mean marks obtained by the group.
5. Find the mean of first 10 even natural numbers.
6. If the mean of x, x + 2, x + 4, x + 6 and x + 8 is 6, then find the value of x.
7. If the mean of 6, 4, 7, s and 10 is 8, find the value of
Answers
Answer:
2. As the first five whole numbers are 0, 1, 2, 3, and 4. Mean = (Sum of observations)/(Number of observations) = (0 + 1+ 2 + 3 +4)/5 = 2.
3. 23 + 26 + 28 + 32 + 33 + 35 + 38 + 40 + 41 + 54)/10 ... We find the age of oldest teacher is 547 years and the age of the youngest teacher is 23 ...
4. Ex 3.1, 6 The marks (out of 100) obtained by a group of students in a science test are 85, 76, 90, 85, 39, 48, 56, 95, 81 and 75. Find the: ...
5. Therefore, the mean of the first 10 even natural numbers is 11. Note: We can solve this sum with a different approach. We can literally sum all the even numbers from 2 to 20 and then divide it by 10.
6. Total number = 5. Mean = Sum of total number/ Total number. ⇒ ( x + x + 2 + x + 4 + x + 6 + x + 6 + x + 8)/5 = 13. ⇒ 5x + 20 = 65. 5x = 65 – 20 = 45. x ...
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Find the mean of x, x + 2, x + 4, x + 6, x + 8. - Studyrankersonline
x + x + 2 + x + 4 + x + 6 + x + 8 / 5 = 5x + 20 / 5 = x + 4 ...
7. If the mean of 6, 4, 7, p and 10 is 8, find the value of p.