Question

the class marks obtained by students of a class are 104 114 124 134 154 64 find the class size and the class interval. plzz explain carefully.???☺☺☺☺☺

Answer 1

Given class marks = 104,114,124,134,154,64.

NOTE: We know that class size is the difference between the class marks of two adjacent classes class size.

class size(h) = 114 - 104

                     = 10.

classmark a = 104.


We know that lower class interval = a - h/2

                                                         = 104 - 10/2
   
                                                         = 104 - 5

                                                         = 99.



We know that upper-class interval = a + h/2

                                                          = 104 + 10/2

                                                          = 104 + 5

                                                          = 109.


Hence the first class interval is 99-109.

Therefore, the class intervals are 99-109,109-119,119-129,129-139,139-149,149-159,159-169.


Hope this helps!