Question

gale's grade in science for the term is determined by the average of five test grades. his first four grades are 80, 95, 78, and 90. in order to get a b for the term, gale needs to have an average of 84. what grade must gale get on the next test to get a b for the term? write an inequality and solve.

Answer 1

This kid would need a 90% on his next test to get a b on that term. That kid should of tryed harder

Answer 2

Answer: 77

Explanation:

Mean as a measure of central tendency is the method used to calculate the average of numbers or objects.

Mean = sum of the numbers given/total numbers given

Given the average/mean to be 84,

The sum of the scores given will be;

80 + 95 + 78 + 90 + x where x is the grade needed by Gale for him to get a 'b' for the term to have an average of 84

Using the formula for finding average, we will add the numbers and divide it by 5 which is the total number in question. This gives;

84 = (80 + 95 + 78 + 90 + x)/5

Cross multiplying we have;

84×5 = 343+x

420 = 343+x

x = 420-343

x = 77

This means that gale must get a score of 77 on the next test in order to get a 'b' for the term.