Question
A boy scored the following marks in various class tests during a terminal exam, each test being marked out of $20.17, 15, 16, 7, 10, 14, 12, 19, 16, 12$ Find his average mean marks.
✓
Answer
Mean $=\frac{\sum x}{N}$
Avg. mean marks
$=\frac{17+15+16+7+10+14+12+19+16+12}{10} $
$=\frac{138}{10} $
$=13.8 .$
Avg. mean marks
$=\frac{17+15+16+7+10+14+12+19+16+12}{10} $
$=\frac{138}{10} $
$=13.8 .$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
If $4x^2+ y^2= a$ and $xy= b$, find the value of $2x + y.$
→If $\left(\log 7-\log 2+\log 16-2 \log 3-\log \frac{7}{45}\right)=1+\log n$, find the value of $n$.
[Hint: $R H S=\log 10+\log n=\log (10 n)$.
→[Hint: $R H S=\log 10+\log n=\log (10 n)$.
State, whether the following numbers is rational or not : $( 2 + \sqrt2 )^2$
→Can you construct a $\triangle ABC$ in which $AB =5 cm, BC =4 cm$ and $AC =9 cm$ ? Give reason.
→Express the following in exponential form :$\log_{10}0.01 = - 2$
→Without using trigonometric tables, evaluate.
$\cos ^2 24^{\circ}+\cos ^2 66^{\circ}$
→$\cos ^2 24^{\circ}+\cos ^2 66^{\circ}$
In the following figure $, A B=A C$ and $A D$ is perpendicular to $B C$. $B E$ bisects angle $B$ and $E F$ is perpendicular to $A B.$ Prove that $: \mathrm{BD}=\mathrm{CD}$
→If $\log _{10} x = a,$ express the following in terms of $x: 10^{2a -3}$
→Find the value of $'A\ ',$ if $2 \sin 2A = 1$
→Simplify : $(3 x+1)^2-(3 x+2)(3 x-1)$
→