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yuradex [85]
3 years ago
7

The population at MS 137 was 1850 students in the year 2009. In two years, by 2011, the population increased by 20percent. By 20

13 the population decreased by 15percent. What was the population in 2013?
Mathematics
1 answer:
Damm [24]3 years ago
5 0

Answer:


Step-by-step explanation:

1,850x20% = 370  (student population increased by 370 students in 2011)

1,850+370= 2,220 (total number students in 2011)

2,220x15% = 333 (decreased by 333 students in 2013)

2,220-333= 1,887 (total population of students in 2013)

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What is the area of the grey matting in this 8” by 10” picture frame if the picture to be framed is 4” x 6”?
Alex17521 [72]

Step-by-step explanation:

Your answer would be 841 inches

8 0
3 years ago
An experiment was conducted to examine two different memorization methods to see which method allows people to remember better.
wlad13 [49]

Question Completion:

SubID  Memory1     Memory2

1                 71                78

2               75                75

3               77                82

4               90                91

5               72                90

6               79                 81

7               84                 75

8               75                 86

9               85                 92

10              75                 77

11               72                 92

12               76                87

13               77                93

14               90                94

15               84                78

16               73                92

17               75                85

18               87                86

19               75               95

20              70               94

21               72               75

22              90               84

23               81               94

24               87               82

25              90               82

26              87               79

27              78               94

28              78               79

29              70               82

30               81               80

31               80               78

32              90               87

33              83               90

34               81               85

35              73               88

36              82               82

37              84               94

38              85               86

39              77               94

40               82              83

Answer:

Since the mean of Memory1 (reciting method) (79.8) is smaller than the mean of Memory2 (imagery method) (85.5), we can conclude that there is a significant difference in memory performance between the reciting method and the imagery method.

Step-by-step explanation:

a) Data and Calculations:

SubID  Memory1     Memory2

1                 71                78

2               75                75

3               77                82

4               90                91

5               72               90

6               79                81

7               84                75

8               75                86

9               85                92

10              75                77

11               72                92

12              76               87

13              77               93

14              90               94

15              84               78

16              73               92

17              75               85

18              87               86

19              75               95

20             70               94

21              72               75

22             90               84

23              81               94

24             87               82

25            90               82

26             87               79

27             78               94

28             78               79

29             70               82

30              81               80

31              80               78

32             90               87

33             83               90

34              81               85

35             73               88

36             82               82

37             84               94

38             85               86

39             77               94

40             82               83

Total     3,193          3,421

Mean     79.8            85.5

Difference in means = 5.7 (85.5 - 79.8)

7 0
3 years ago
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jarptica [38.1K]

Answer:

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Step-by-step explanation:

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