Question

Please answer all of these marking brainliest

Answer 1

Answer:

7. A)

8. D)

9. Mean of 100 items = 49.

Sum of 100 items = 49*100 = 4900 .

The Sum of correct observations = 210

But, The Sum was reading as 110 .

So , We need to add 100 .

Now, Sum of 100 items = 4900 + ( 210 - 110) = 5000 .

Mean = 5000/100 = 50 .

10. common factor

11. direct

12. step-deviation

13. 4

(attachment)

14. 9

Given that the mean of first n natural numbers = 5n/9.

We know that mean of n natural numbers = (n + 1)/2.

(n + 1)/ 2 = 5n/9

9(n + 1) = 2(5n)

9n + 9 = 10n

9 = n.

15. 6

use formula,

{x}={fi xi}{f}

where{x} is the mean , f is number of data values .

here given,

{x}=8.1

fi xi=132+5k  and f=20

so, 8.1 = (132 + 5k)/20

8.1 × 20 = 132 + 5k

162 = 132 + 5k

162 - 132 = 5k

30 = 5k

k = 6

MARK ME AS BRAINLIEST!! GOOD LUCK :))