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3 years ago

0.4(3k – 0.6) plz help

1 answer:

8 0

0.4 times 3k is 1.2
Multiply the 2 number between the parentheses.

0.4 times 0.6 is 0.24
Multiply the other 2 numbers

1.2-0.24= 0.96
Subtract the 2 numbers that you got after multiplying.

Answer:0.96

Hope this helps you!!!

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he two-way table shows the medal count for the top-performing countries in the 2012 Summer Olympics. A 5-column table has 5 rows

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Step-by-step explanation:

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Answer:

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B) 0.00022

Step-by-step explanation:

A) First of all let's find the total grading time from 6:50 P.M to 11:00 P.M.:

Total grading time; X = 11:00 - 6:50 = 4hours 10minutes = 250 minutes

Now since we are given an expected value of 5 minutes, the mean grading time for the whole population would be:

μ = n*μ_s ample = 42 × 5 = 210 minutes

While the standard deviation for the population would be:

σ = √nσ_sample = √(42 × 6) = 15.8745 minutes

To find the z-score, we will use the formula;

z = (x - μ)/σ

Thus;

z = (250 - 210)/15.8745

z = 2.52

From the z-distribution table attached, we have;

P(Z < 2.52) ≈ 0.99413

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Thus, total time is now 250 + 10 = 260 minutes

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3 years ago

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