Problem-Solving and Data Analysis

In data set A, the greatest value is $9$ and the smallest value is $1$. Hence, the range of data set A is $9 - 1 = 8$. Similarly, in data set B, the greatest value is $9$ and the smallest value is $2$. Hence, the range of data set B is $9 - 2 = 7$. Thus, the range of data set A is greater than the range of data set B.

We can see that the values of data set B are more concentrated near the mean, and the values of data set A are more spread out. Hence, the standard deviation of data set A is greater than the standard deviation of data set B.

The range of data set A is greater than the range of data set B, and the standard deviation of data set A is greater than the standard deviation of data set B.

We can see from the table that there are a total of $8$ big blocks, and $4$ of them are red. Hence, if a big block is selected at random, the probability of it being red is

The estimate for the typing speed is in the middle of the confidence interval. Hence, the estimate is

words per minute. The margin of error, in words per minute, is half of the confidence interval (in other words, it is the difference between the estimate and a limit of the confidence interval). Hence, it is

The margin of error, as a percentage of the estimate, is