(adsbygoogle = window.adsbygoogle || []).push({}); The problem statement, all variables and given/known data

The attempt at a solution

I started by finding the expected frequencies corresponding to the intervals. I used the z-table for this. I got a chi-square value of 3.47.

The answer, however, should be 1.98.

Should I have used the z-table as mentioned earlier, or should I use the t-table? If so, how would I use the t-table?

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# Chi-square Problem

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