The average height of students in a batch is 100 cm and the standard deviation is 15. However, Surya believes that this has changed, so he decides to test the height of 75 random students in the batch. The average height of the sample comes out to be 105. Is there enough evidence to suggest that the average height has changed?
Answers
Answered by
0
Explanation:
Total students =100
Total marks of 70 students is 75×70=5250.
Total marks of girls is 7200-5250=1950
So average of girls is
195030=65
Answered by
2
Answer:
Hello Sirapana
Explanation:
How are you
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