Data Managment! Help!?

Data Managment! Help!?

1. If X ~N (350,16^2)then the standard deviation equals
a) 16 b) 350 c) 4 d) 256 e) none of the above

2.The variance of a sample of data is 4. The standard deviation of this sample is:

a) 16 b) 4 c) 2 d) 1 e) none of the above

3.A set of five different whole numbers are arranged in order from smallest to largest. The third number is then decreased by one. Which measure of spread for the set could this change?

a) the range b) the IQR c) the standard deviation d) all of the above

4.A student used a measure of spread to conclude that the movie ticket prices (in dollars) in set A were more spread out than those in set B. Which measure of spread did he use?
Set A: 10, 11, 11, 13, 15 Set B: 10, 11, 13, 13, 15

a) the range b) the IQR c) the standard deviation d) none of the above

5.The class scores from a math quiz are as follows: 8, 6, 10, 5, 8, 6, 9, 7, 8, 10, 4, 5, 7, 8, 9, 8, 10, 5, 8, 7

Organize the data in a frequency table.

6. Maple tree diameters in a forest area are normally distributed with a mean of 10 inches and a standard deviation of 2.5 inches. In a forest of 2000 maple trees, how man would have a diameter greater than 15 inches. Hint: think of the properties of a normal graph.

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