Question

Cn anyone answer me corectly pls I will mark you as brinlist answer pls​

Answer 1

Step-by-step explanation:

8/16=10/k

8k=160(cross multiplication)

k=160/8

k=20

Answer 2

Here,

• Total frequency = 40 + k
• Total sum = 260 + 10k

We know,

$\text{Mean =} \bf{ \frac{Sum}{ Frequency} } \\ \\ \tt 7.2 = \frac{260 + 10k}{40 + k} \\ \\ \tt7.2(40 + k) = 260 + 10k \\ \tt 288 + 7.2k = 260 + 10k \\ \tt288 - 260 = 10k - 7.2k \\ \tt28 = 2.8k \\ \\ \tt \frac{2.8k}{2.8} = \frac{28}{2.8} \\ \\ \tt \: k = 10$