update charting

docs/lessons/charting/acceleration.md

@@ -38,21 +38,30 @@ NOTE: The colors of the charts reflect the color of the micro:bit simulator. In
 Vigorously move the micro:bit in the micro:bit simulatator by moving the micro:bit image from side to side. Every time the micro:bit moves in the x direction in the simulator,  you are generating data points that can be reviewed in Excel. The more attempts to move the micro:bit from side to side, the more data being saved in Excel. After you have vigarously moved the micro:bit simulator from side to side for a sufficient amount of time, you are ready to graph or chart the accceleration of the micro:bit. We want a printout of our acceleration on Excel that can be graphed in Excel. 
 
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+Review and write down your observations from the Excel data. Then chart or graph the data collected by using a tool in Excel. 
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 The final part of this experiment is opening and reviewing the data in the Excel CSV file. Simply click on the line beneath the simulator. A CSV file will be generated to display the data points collected by moving the micro:bit in the X direction. Then click or tap on the data Excel file that was downloaded to your local Downloads Folder. 
 
-![](/static/mb/data3.png)
 
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-Review and write down your observations from the Excel data.
 
+First, click or tap on the first two columns (A, B) to  include the time of the data being collected; b) the results of acceleration data on the micro:bit  
 
+![](/static/mb/data7.jpg)
 
-* Chart the data collected by using a graph in Excel
+Then click or tap on Recommended Charts
-* Connect a micro:bit to your computer using your USB cable; compile; and move the micro:bit in the "x" direction. 
+
+![](/static/mb/chart1.png)
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+Finally, click or tap on the option called Line, then click OK. A line chart is used to display trends over time. We will use the line chart because there are many data points over time. 
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+![](/static/mb/chart_title.png)
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+* Connect a micro:bit to your computer using your USB cable; compile; and repeat this experiment by moving the micro:bit in the "x" direction. Then collect and chart the data on Excel. 
 * Review and analyze the actual micro:bit device data on Excel
 
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 Excellent, you're ready to continue with the [challenges](/lessons/charting/acceleration-challenge)