Plz help me in six number group A

1m 54cm

Step-by-step explanation:

10 students at 1m 40cm

15 students at 1m 58cm

13 students at 1m 60cm

Keep in mind that ratio between cm to m is 1cm/0.01m.

So let find the average by converting cm to m first for the 38 students.

10 students:  1m + (40cm)(0.01m/1cm) => 1.4 m

15 students:   1m  + 58cm(0.01m/1cm)  => 1.58 m

13 students:  1m 60cm(0.01m/1cm)  => 1.60 m

so the average is weighted:

(10*1.4 +15*1.58 + 13(1.6))/38

Therefore the average model height is 1.54 m or 1m 54cm

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.