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pentagon [3]
2 years ago
9

In a city with three high schools, all the ninth graders took a Standardized Test, with these results:High Scool Mean Score test

Number of ninth gradeGlenwood 79 285Central city 94 336Lincoln High 72 191The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 81.7 . Of course, that is incorrect. What is the mean score for all ninth graders in the city? USE EXCEL. Round your answer to one decimal place.
Mathematics
1 answer:
Eva8 [605]2 years ago
5 0

Answer: 83.56

Step-by-step explanation:

To calculate the mean score for all ninth graders in the city, we multiply the mean score test for each school by the number of months grade students and then add all together and divide by the total ninth grade students. This is solved below.

Mean = [(79 × 285) + (94 × 336) + (72 × 191)]/285+336+191

= (22515+31584+13752)/812

= 67851/812

= 83.56

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3 years ago
The Empire State Building weighs about 7.3×108pounds. The One World Trade Center building weighs about 88,200,000 pounds. What i
In-s [12.5K]

Answer:

8.182X10^8 $pounds

a=8.182 and b=8

Step-by-step explanation:

Weight of the Empire State Building =7.3X 10^8 pounds.

Weight of the One World Trade Center building= 88,200,000 pounds.

=8.82 X 10^7

The addition of the two:

=7.3X 10^8+8.82 X 10^7\\$To make it easier to add, express both as powers of 8\\=7.3X 10^8+0.882 X 10^8\\=(7.3+0.882)X10^8\\=8.182X10^8 $ pounds

Comparing with the form: aX10^b

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4 0
2 years ago
Which number is an irrational number?
xxTIMURxx [149]

Answer:

3.5

Step-by-step explanation:

6 0
3 years ago
How do I find the percent of budget?​
ch4aika [34]

Answer:

First, subtract the budgeted amount from the actual expense. If this expense was over budget, then the result will be positive.

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6 0
2 years ago
Esi says that the value of z when z^2 = 80 does not belong in either of these categories since z must be greater than 8.
Anettt [7]

Answer:

9

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if z=8 then z^2 would be 64, which is not equal to 80

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7 0
2 years ago
Read 2 more answers
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