Answer:
34
Step-by-step explanation:
The mean is calculated as
mean =
let x be the missing frequency, then
Total frequency × midpoint
= (16 × 2) + 7x + (20 × 12) + (10 × 17) = 32 + 7x + 240 + 170 = 442 + 7x
Total frequency = 16 + x + 20 + 10 = 46 + x, thus
= 8.5 ( cross- multiply )
442 + 7x = 8.5(46 + x)
442 + 7x = 391 + 8.5x ( subtract 8.5x from both sides )
442 - 1.5x = 391 ( subtract 442 from both sides )
- 1.5x = - 51 ( divide both sides by - 1.5 )
x = 34
The missing frequency is 34
Using compound interest, the rates per compounding period are given as follows:
a) 0.1273 = 12.73%.
b) 0.0833 = 8.33%
c) 0.0617 = 6.17%
<h3>What is compound interest?</h3>The amount of money earned, in compound interest, after t years, is given by:
In which:
The <u>interest rate per compounding period</u> is given as follows:
For item a, the parameters are:
r = 0.12, n = 52.
Hence:
For item b, the parameters are:
r = 0.08, n = 104.
Hence:
For item c, the parameters are:
r = 0.06, n = 12.
Hence:
More can be learned about compound interest at brainly.com/question/25781328
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