Itook a sample of the grade point averages for students in my class. for 25 students, the standard deviation of grade points was 0.65 and the mean was 2.89. a 95% confidence interval for the average grade point average for all students in my class is:

a. (2.64, 3.14).
c. (2.53, 3.25).
b. (2.62, 3.16).

B. (2.62, 3.16)

Step-by-step explanation:

Confidence Interval = mean + or - (t×sd)/√n

Mean = 2.89, sd = 0.65, n = 25, degree of freedom = n-1 = 25-1 = 24, t-value corresponding to 24 degrees of freedom and 95% confidence level is 2.064

Lower limit = 2.89 - (2.064×0.65)/√25 = 2.89 - 0.27 = 2.62

Upper limit = 2.89 + (2.064×0.65)/√25 = 2.89 + 0.27= 3.16

95% confidence interval is (2.62, 3.16)

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.