Question

please answer this question ​

Answer 1

Answer:

47. 88

Step-by-step explanation:

3+10+25+49+65+73+78+80     =  383   = 47.875 = 47. 88 (correct 2 d.p)

                   8                                   8

Answer 2

Step-by-step explanation:

Here, cumulative frequencies are 3,10,25,49,65,73,78,80

Number of students

3

10-3=7

25-10=15

49-25=24

65-49=16

73-65=8

78-73=5

80-78=2

Sum of all frequencies=3+7+15+24+16+8+5+2=80

Mean=18.56