The number of incoming phone calls at company switchboard throughout 1-minute intervals is believed to have Poisson distribution. Use a= .10 and following data to test the assumption that the incoming phone calls follow Poisson distribution.
Number of Incoming
Phone Calls During
a 1-Minute Interval Observed Frequency
0 18
1 25
2 23
3 15
4 12
5 6
6 1
Total: 100
Calculate the value of the test statistic (to 2 decimals). P value is?