pls help explain step by step

Subject:MathPrice: Bought3

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pls help explain step by step ..thank you

 

(A)Use technology to compute summary statistics (mean, SD, and five number summary) for the lead levels data from problem 4.

1. What lead level is the 50th percentile?
2. What's the average lead level?
3. On average, how far are the lead levels from the mean lead level?
4. What is these lead levels' interquartile range?

 

 

 

(b),Here a stem-and-leaf display for course grades of an algebra class:

 

 

0 | 79

1 |

2 |

3 | 2

4 |

5 | 38

6 | 3679          ''7 | 0'' means 70

7 | 001389

8 | 03466789

9 | 011257

 

1. How many students earned Bs (course grades from 80 to 89)?
2. Which value is greater: the mean or the median? How do you know?
3. How many students would you estimate stopped participating in the class during the quarter? In the plot, what are their course grades called?