Question

the full table gives the marks obtained by 80 students in a selection test

marks BELOW 10 Below 20 Below 30 below 40 Below 50 Below 60

no. of students 3 12 27 57 75 80

no.of students

Answer 1

Mean = 33.25 , Median = 34.33 Mode = 35.55

Step-by-step explanation:

Class     cf          f          Mean Class      f*mean Class

0-10        3          3              5                       15

10-20      12        9             15                     135

20-30     27       15             25                   375

30-40     57       30            35                  1050

40-50     75        18            45                    810

50-60     80        5             55                   275

               Total   80                                   2660

Mean = 2660/80  = 33.25

Median =  30  +  10 * (40 - 27)/30

= 30 + 4.33

= 34.33

Mode = 30 +  10 *( 30 - 15)/(30 - 15 + 30 - 18)

= 30 + 5.55

= 35.55

Learn More:

a total of 25 patients admitted to a hospital are tested for blood sugar ...

https://brainly.in/question/7508656

Find the mode, median and mean for the following data: Marks ...

https://brainly.in/question/7477608

Answer 2

Above picture is solution of this question

if I'd it right then

Step-by-step explanation:

MARK ME AS BRAINLIST

ʘ‿ʘʘ‿ʘʘ‿ʘʘ‿ʘ(っ˘з(˘⌣˘ )(っ˘з(˘⌣˘ )(っ˘з(˘⌣˘ )(っ˘з(˘⌣˘ )(っ˘з(˘⌣˘ )(っ˘з(˘⌣˘ )ᕙ[･۝･]ᕗᕙ[･۝･]ᕗᕙ[･۝･]ᕗᕙ[･۝･]ᕗ