need b-1 please

Consider a multinomial experiment with n=220 and k=4. The null hypothesis to be tested is H0:P1=p2=p3=p4=0.25 : The observed frequencies resulting from the experiment are: (You may find it useful to reference the appropriate table: chi-square table or Ftable) a. Choose the appropriate altemative hypothesis. Not all population proportions are equal to 0.25. All population proportions differ from 0.25. b-1. Calculate the value of the test statistic. (Round intermediate calculations to at least 4 decimal places and final answer to 3 decimal places.)