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Determine the sample size needed to construct a 95% confidence interval to estimate the average GPA for

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Determine the sample size needed to construct a 95% confidence interval to estimate the average GPA for the student population at Wilmington College with a margin of error equal to 0.2. Assume the standard deviation of the GPA for the student population is 1.0. Verify your result using PHStat.
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Fazil P
I am a Civil Engineering Student. I am currently studying at NIT Calicut which is one of the best engineering colleges in India.I got in this college by cracking one of the toughest exam in India, JEE exam. I completed my Higher secondary education with an aggregate percentage of 98% . I completed matriculation with full A+. I like to share my knowledge and I often helps my classmates in academics. I used to tutor high school students in their studies.
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