Question

the marks out of hundred obtained by a group of students in a science test our 85,76 ,90,85 ,39,56, 48,78 and 81 find the range of the marks obtained find the arithmetic mean . ( please help me it's urgent)​

Answer 1

Answer:

70.89, 51

Step-by-step explanation:

$85+76+90+85+39+56+48+78+81 \\ = 638 \div 9 \\ = 70.89 = mean \\ \\ \\ \\ 90 - 39 = 51 = range$

Answer 2

Answer:

Range = 90-39= 51

arithmetic mean= 70.88

Step-by-step explanation:

Range= maximum value- minimum value

arithmetic mean= sum of numbers / number's