Easy -1.2 This is a straightforward histogram interpretation question requiring students to multiply frequency density by class width for each bar and sum the results. It tests basic understanding of histograms but involves only routine calculation with no problem-solving or conceptual challenge beyond knowing that frequency = frequency density × class width.
Kareem bought some tomatoes. He recorded the mass of each tomato and displayed the results in a histogram, which is shown below.
\includegraphics{figure_7}
Determine how many tomatoes Kareem bought. [2]
allow one incorrect frequency density and/or one incorrect
class width
NB 8 + 13 + 18 + 20 +12 soi with four of five correct implies
M1
may be implied by 71
if M0 allow SC1 for 8, 13, 18, 20, 12 and no others seen
Question 7:
7 | 0.4×20+1.3×10+3.6×5+2×10+
0.8×15
71 | M1
A1
[2] | 1.1
1.1 | allow one incorrect frequency density and/or one incorrect
class width
NB 8 + 13 + 18 + 20 +12 soi with four of five correct implies
M1
may be implied by 71
if M0 allow SC1 for 8, 13, 18, 20, 12 and no others seen
Kareem bought some tomatoes. He recorded the mass of each tomato and displayed the results in a histogram, which is shown below.
\includegraphics{figure_7}
Determine how many tomatoes Kareem bought. [2]
\hfill \mbox{\textit{OCR MEI Paper 2 2022 Q7 [2]}}