What is the chi-square test-statistic for this data?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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You are conducting a multinomial hypothesis test for the claim that the 4 categories occur with the following frequencies:HoHo : pA=0.5p;  pB=0.3p;  pC=0.1;  pD=0.1

Complete the table.

Category Observed
Frequency
Expected
Frequency
Squared
Residual
A 57    
B 28    
C 11    
D 23    



What is the chi-square test-statistic for this data?
χ2=

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