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15 Oct 2020, 09:30
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
95% (00:59) correct
5%
(01:53)
wrong
based on 107
sessions
History
Date
Time
Result
Not Attempted Yet
If Sierra’s scores on her first three tests were 90, 93, and 98, what must she score on the fourth test to have 95 as her test average?
A. 95
B. 96
C. 97
D. 98
E. 99
A. 95
B. 96
C. 97
D. 98
E. 99
15 Oct 2020, 09:34
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Explanation:
Sierra’s scores on her first three tests were 90, 93, and 98.
Sum of 3 test = 281
Average in 4 test = 95
So sum of 4 test = 95 * 4 = 380
4th test score = 380-281 = 99
IMO-E
Sierra’s scores on her first three tests were 90, 93, and 98.
Sum of 3 test = 281
Average in 4 test = 95
So sum of 4 test = 95 * 4 = 380
4th test score = 380-281 = 99
IMO-E
15 Oct 2020, 11:10
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Sierra scored 90,93,98 on her first three tests.
Average of the four tests taken needs to be 95.
Total marks obtained till now= 90+93+98= 281
Marks of fourth test is x.
formula of average= (90+93+98+x)/4=95
Therefore, 95*4-281=x.
380-281=x.
Therefore x= 99.
option E is the answer.
Average of the four tests taken needs to be 95.
Total marks obtained till now= 90+93+98= 281
Marks of fourth test is x.
formula of average= (90+93+98+x)/4=95
Therefore, 95*4-281=x.
380-281=x.
Therefore x= 99.
option E is the answer.
