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Find the mean: 4,4,5,6,7,8,10

6.2857142857143

Find the standard deviation: 4,4,5,6,7,8,10

2.21

Find the median: 4,4,5,6,7,8,10

The mean weight is 10 pounds with a standard deviation of 2. What percentage weigh 8-12 pounds?

68 percent

The mean weight is 10 pounds with a standard deviation of 2. What percentage weigh 10-12 pounds?

34 percent

How many trees are 250-300 cm tall?

Estimate the mean

Anna walks an average of 5 miles a day with a standard deviation of 2. What percentage does she walk under 4 miles?

30.85 percent

Anna walks an average of 5 miles a day with a standard deviation of 2. What percentage does she walk over 8 miles?

6.6 percent

The mean of the data is 30 with a standard deviation of 8. Find the z score of the value 20.

-1.25