Can you check my answers? CHAPTER 6 NUMBER OF DAYS TAKEN TO COMPLETE A CERTAIN A

Question

Can you check my answers?

CHAPTER 6 NUMBER OF DAYS TAKEN TO COMPLETE A CERTAIN ASSIGNMENT · 15 0 Number of Days 4. If the graph of the function y-/() is shown 5. An asignment was given to 50 middle school students to complete. The graph above shows a frequency distribution of the number of days it took the students to complete the assignment. What is the mean number of days it took for a student to complete the assignment? (A) 2.8 (B) 3.0 above, which of the following could be the graph of y-fx+l)-2? 6. Ifa

Explanation / Answer

4) option c is correct

now f(x) = 0 for x=0

f(x+1) will be zero at x=-1

f(x+1)-2 = -2 at x=-1 only c satisfy this condition

5) option c is correct

mean number of days = sum ( no of days * number of student ) / sum ( number of student )

                                       = ( 1*5+2*10+3*15+4*15+5*5)/(5+10+15+15+5)

                                         =155/50= 3.1

6)

option a is correct always

as a< b

a -b is always -ve and | a-b| is always gretter than zero

7)

option a is correct

all integer multiplies of 1/2 that are gretter tnan 0 and less than 1000

that is       0 < m*1/2 < 1000     where m is integer

thus m =, 2 ,4 6 8, --------- 1998  

which is finite

there are infinite rational number lies in 7 and 8 hence option b is ont correct

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