Post-exposure radiation levels are approximately Normally distributed. The levels (in Sv) of a random sample of three trauma victims who were recently exposed are 5.5, 6.2, and 4.8. A 95% confidence interval for the mean based on these data is:

0.404

Explanation:

The calculation of confidence interval for the mean is shown below:-

Data provided in the question

Mean = 5.5

The Standard deviation for three values  is 0.7

Since there is 95% of the confidence interval so the critical value is

Now

Margin error is

= 1.74

Now,

The Standard error is

= 0.404

Hence, the confidence interval for the mean based is 0.404

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