Answer:
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Using the t-distribution, as we have the standard deviation for the sample, it is found that the 95% confidence interval for the number of units students in their college are enrolled in is (11.7, 12.7).
<h3>What is a t-distribution confidence interval?</h3>
The confidence interval is:

In which:
is the sample mean.
- s is the standard deviation for the sample.
The critical value, using a t-distribution calculator, for a two-tailed <em>95% confidence interval</em>, with 49 - 1 = <em>48 df</em>, is t = 2.0106.
Hence:


The 95% confidence interval for the number of units students in their college are enrolled in is (11.7, 12.7).
More can be learned about the t-distribution at brainly.com/question/16162795
Phenotypes are the physical characteristics of an organism, whereas the genotypes are the genetic make up.
Having the same or similar phenotypes is based upon chance. For example, two individuals may have blond hair, blue eyes and fair skin, but they are not related at all. Their genotype is different as they have different parents and relatives and so on, but physically, they can look the same, perhaps due to environmental factors.