@nisha,

You can calculate simple moving average(SMA) by writing few lines of code and pushing the respective values to dataSeries will render the chart with SMA series. Please take a look at the below code snippet for calculating 7 Day SMA and pushing it to chart dataSeries.

function calculateMovingAverage(chart) {
  var numOfDays = 7;
  // return if there are insufficient dataPoints
  if(chart.options.data[0].dataPoints.length <= numOfDays) return;
  else {
    // Add a new line series for  Moving Averages
    chart.options.data.push({
      type: "spline",
      markerSize: 0,
      name: "SMA",
      yValueFormatString: "#,##0.00",
      dataPoints: []
    });
    var total;
    for(var i = numOfDays; i < chart.options.data[0].dataPoints.length; i++) {
      total = 0;
      for(var j = (i - numOfDays); j < i; j++) {
        total += chart.options.data[0].dataPoints[j].y;
      }
      chart.options.data[1].dataPoints.push({
        x: chart.options.data[0].dataPoints[i].x,
        y: total / numOfDays
      });
    }
  }
}

Also, Please have a look at this JSFiddle for complete code.

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Suyash Singh
Team CanvasJS