Question

# 1. In a class of 20 students, 13 students are exactly 5 feet 6 inches tall,...

1. In a class of 20 students, 13 students are exactly 5 feet 6 inches tall, whereas the rest of the class is over 5 feet 6 inches. Andrew, who is 5 feet 10 inches tall, joins the class.
Which of the following statements is true about the mean? Explain as well.
i Mean height of the class increases ii. Mean height of the class stays the same iii. Mean height of the class goes down iv. Cannot tell

Earlier there were 20 students and exactly 13 were 5 feet 6 inches tall, whereas the rest of the class is over 5 feet 6 inches.

Andrew, who is 5 feet 10 inches tall, joins the class.

Now, there are 21 students and exactly 13 were 5 feet 6 inches tall, whereas the rest of the class is over 5 feet 6 inches.

Since, we do not know the previous mean height of the class if it was grater than 5 feet 10 inches or lesser. We can not interpret any change in mean

iv. Cannot tell

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