The average IQ of $4$ people is $110$ . If three of these people each have an IQ of $105$ , what is the IQ of the fourth person?

110

No worries! We‘ve got your back. Try BYJU‘S free classes today!

115

No worries! We‘ve got your back. Try BYJU‘S free classes today!

120

No worries! We‘ve got your back. Try BYJU‘S free classes today!

125

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D 125
Average IQ of $4$ people $= 110$
$∴$ total IQ of $4$ people $=$ $110 \times 4 = 440$
Average IQ of $3$ people $= 105$
$∴$ total IQ of $3$ people $=$ $105 \times 3 = 315$
Then IQ of forth person $=$ $440 - 315 = 125$

Suggest Corrections

Similar questions

The IQ and EQ scores for 5 people are shown below. Find the rank coefficient of correlation for their IQ and EQ.

$\begin{matrix} I Q & E Q 100 & 115 115 & 105 125 & 110 145 & 100 90 & 120 \end{matrix}$

Q. The frequency distribution of IQ (Intelligent Quotient) of 80 candidates is given below.

IQ	70-80	80-90	90-100	100-110	110-120	120-130	130-140
No. of candidates	7	16	20	17	11	7	2

Find the median IQ of the candidates.

IQ of a person is given by the formula

Where MA is mental age and CA is chronological age. If 80 ≤ IQ ≤ 140 for a group of 12 years old children, find the range of their mental age.

Q. If

\frac{a + i b}{c + i d} = p + i q

then

\frac{a - i b}{c - i d} = p - i q

The IQ of person is given by the formula, $I Q = \frac{m}{c} \times 100$ , where m is the mental age and c is the chromological age. If $80 \leq I Q \leq 140$ for a group of 12-year children, find the range of their mental age.

Join BYJU'S Learning Program

The average IQ of 4 people is 110. If three of these people each have an IQ of 105, what is the IQ of the fourth person?

The correct option is D 125Average IQ of 4 people =110∴ total IQ of 4 people = 110×4=440Average IQ of 3 people =105∴ total IQ of 3 people = 105×3=315Then IQ of forth person = 440−315=125

The average IQ of $4$ people is $110$ . If three of these people each have an IQ of $105$ , what is the IQ of the fourth person?

The correct option is D 125
Average IQ of $4$ people $= 110$
$∴$ total IQ of $4$ people $=$ $110 \times 4 = 440$
Average IQ of $3$ people $= 105$
$∴$ total IQ of $3$ people $=$ $105 \times 3 = 315$
Then IQ of forth person $=$ $440 - 315 = 125$