MCQ
The mean of the data when $\sum\text{f}_\text{i}\text{d}_\text{i}=435,\sum\text{f}_\text{i}=30$ and $\text{a}=47.5$ is :
- A$63$
- B$30$
- ✓$62$
- D$47.5$
✓
Answer
Correct option: C.
$62$
Mean$=\bar{\text{x}}=\text{a}+\frac{\sum\text{f}_\text{i}\text{d}_\text{i}}{\sum\text{f}_\text{i}}$
$=47.5+\frac{435}{30}$
$= 47.5+14.5=62$
$=47.5+\frac{435}{30}$
$= 47.5+14.5=62$
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
What should be added to the polynomial $x^2-5 x+4$, so that $3$ is the zero of the resulting polynomial?
→The area of a circular path of uniform width $h$ surrounding a circular region of radius $r$ is:
→If radii of two concentric circles are $4\ cm$ and $5\ cm,$ then the length of each chord of one circle which is tangent to the other circle is :
→The radius of a circle whose circumference is equal to the sum of the circumferences of the two circles of diameters $36 cm$ and $20 cm$ is
→In a right-angled triangle $PQR , \angle Q =90^{\circ}$. If $\angle P =$ $45^{\circ}$, then value of $\tan P -\cos ^2 R$ is
→The distance between the points $(a, b)$ and $(-a, b)$ is :
→The decimal expansion of the rational number $\frac{14587}{1250}$ will terminate after :
→From an external point $P$, tangents $P A$ and $P B$ are drawn to a circle with centre $O$. If $C D$ is the tangent to the circle at a point $E$ and $P A=14 \ cm$, find the perimeter of $\triangle \text{P C D}$.
→If $8\tan \text{x} = 15,$ then $\sin \text{x} - \cos \text{x}$ is equal to :
→The value(s) of $k$ for which the quadratic equation $2 x^2+k x+2=0$ has equal roots, is
→