The table shows the mark obtained by students in a test.<...
The table shows the mark obtained by students in a test.
| Marks | 1 | 2 | 3 | 4 | 5 |
| Frequency | 2 | k | 1 | 1 | 2 |
4
1
2
3
Correct answer is B
x̄ \(=\frac{∑fx}{∑f}= 3\)
\(=\frac{(1 \times 2)+(2 \times k)+(3 \times 1)+(4 \times 1)+(5 \times 2)}{2 + k + 1 + 1 + 2}= 3\)
\(=\frac{2 + 2k + 3 + 4 + 10}{6 + k} = 3\)
\(=\frac{19 + 2k}{6 + k} = 3\)
\(=\frac{19 + 2k}{6 + k} = \frac{3}{1}\)
=19+2k=3(6+k)
=19+2k=18+3k
=2k-3k=18-19
=-k=-1
∴k=1
Simplify \(\sqrt{(\frac{-1}{64})^{\frac{-2}{3}}}\)...
Calculate in surd form, the value of \(\tan 15°\)....
If \(P = \begin{pmatrix} 1 & 2 \\ 5 & 1 \end{pmatrix}\) and \(Q = \begin{pmatrix} 0 & 1 ...
If Un = kn\(^2\) + pn, U\(_1\) = -1, U\(_5\) = 15, find the values of k and p....
If log 5(\(\frac{125x^3}{\sqrt[ 3 ] {y}}\) is expressed in the values of p, q and k respec...
Age in years 10 - 14 15 - 19 20 - 24 25 - 29 30 - 34 Frequency 6 8 14 10 12 ...
Find the standard deviation of the numbers 3,6,2,1,7 and 5. ...