1) which number rounds up when rounded to the nearest tenth?

55. 24

170.93

0.12

8.15



2)

estimate the value of 2968 + 9912 by rounding each number to the thousands.

14,000

13,000

12,000

7000


3)

which statement below shows the best use of friendly numbers to estimate the value of 27 ·times 4

25 times 4 = 100

30 times 5 = 150

27 times 4 = 108

20 times 4 = 80

4)

marcus has 78 baseball cards and 45 basketball cards. estimate the total number of cards marcus has.

30

33

123

130

5)

determine which answer is reasonable for 4. 8 times 9.2.

14

45.36

432

870.4

( be 100 sure)

step-by-step explanation:

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.