The Springfield Emergency Medical Service keeps records of emergency telephone calls. A study of 150 five-minute time intervals resulted in the distribution of number of calls as follows. For example, during 18 of the five-minute intervals, no calls occurred. Use the chi-square goodness-of-fit test and?=.01to determine whether this distribution is Poisson.

Find the observed value of chi-square. Round the answer to 2 decimal places.

Number of Calls(per 5-minute interval) Frequency

0 18

1 28

2 47

3 21

4 16

5 11

6 or more 9