Question

Kara has five exam scores of 89, 82, 69, 79, and 70 in her biology class. What score does she need on the final exam to have a mean grade of 80? Round your answer to two decimal places, if necessary. (All exams have a maximum of 100 points.)

Answer 1

Answer:

91 marks

Step-by-step explanation:

Let marks acquired in 6th exam=z

Mean=sum of observations/no. of observations

80=(89+82+69+79+70+z)/6

480=389+z

z=91 marks

She will have to score 91 marks in the last test to get the desired average.

Answer 2

Concept:

Mean =  sum of observations divided by the number of observations.

Given:

We are given that:

exam scores =  89, 82, 69, 79, and 70

Find:

We need to find that:

Score needed in the final exam to have a mean grade of 80.

Solution:

Let the score in finals be x

ATQ:

(89 + 82 + 69 + 79 + 70 + x ) / 6 = 80

389 + x = 80 ( 6)

389 + x = 480

x = 480 - 389

x = 91.

Therefore, she needs a score of 91 to have a mean grade of 80 ij her final exams.

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