Question

If mean of the data 11, 17, x + 1, 3x, 19, 2x-4, x + 5 is 21, then find the mode of the data.

• A. 15
• B. 19
• C. 11
• D. 17

Answer 1

Answer:

B. 19

$\frac{11+17+x+1+3x+19+2x-4+x+5}{7}=21$

$\frac{49+7x}{7}=21$

$49+7x=21\times 7$

$7x=98$

$x=14$

$11,17,15,42,19,24,19$

mode

$19=2 nos$