Answer:
Explanation:
Based on the passage, it appears that Ruchira's parents are unaware of her interest in painting. This is indicated by several lines in the passage, such as "Even her parents didn't know," "When they came for dinner, she removed the canvases from the wall and hid them in her closet," and "She made excuses when her friends wanted her to go out." These lines suggest that Ruchira is trying to keep her interest in painting a secret from her parents, and that they do not know about her painting or the fact that she has been working on it for two years. This suggests that Ruchira's parents do not have an opinion on her interest in painting, and therefore, the answer is O They are unaware of it.
(b) The mean marks got by 300 students in the subject of statistics are 45. The mean of the top 100 of them was found to be 70 and the mean of the last 100 was known to be 20. What is the mean of the remaining 100 students?
Answer: The mean marks of the remaining 100 students is 6000/100= 60.
Explanation: The mean marks of all the students is 45, and the mean marks of the top 100 students is 70, so the sum of the marks of the top 100 students is 70100=7000.
The mean marks of the last 100 students is 20, so the sum of the marks of the last 100 students is 20100=2000.
The sum of the marks of all the 300 students is 7000+2000+45*100=15000.
The sum of the marks of the remaining 100 students is 15000-7000-2000=6000.
The mean marks of the remaining 100 students is 6000/100= 60.