Could someone me answer this math question

Explanation

5 students got 6 mark each,                                                                                         4 students got 7 marks each,                                                                                       7 students got 8 marks each,                                                                                            10 students got 9 marks each                                                                                   and 4 students got 10 marks each.

(a)  Range is the difference of highest mark and lowest mark. Here, the highest mark is 10 and lowest mark is 6.

So, the range of mark

(b) Total number of students in the group

(c)   Mean is the simple average. So, for finding the Mean, we will divide the total marks obtained by all students by the total number of students.

Total marks obtained by all students

So, the Mean mark of the group

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".

answer: a) 56% women

b)44% men

step-by-step explanation: