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2 years ago

Show working out please

Mathematics

1 answer:

Vlad [161]2 years ago

4 0

If 40% are boys, 60% are grills.

As fractions:

4/10 = 2/5 are boys

6/10 = 3/5 are grills

70% or 7/10 of the boys arrive by car:

(2/5)(7/10) = 14/50 = 7/25

And 60% or 3/5 of the grills arrive by car:

(3/5)(3/5) = 9/25

So in total we have 7/25 + 9/25 = 16/25 = 64/100 = 64%

64% chance that a child arrives by car.

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The U.S. Census Bureau conducts a study to determine the time needed to complete the short form. The Bureau surveys 200 people.

OLga [1]

Answer:

The z-distribution should be used for this problem.

Step-by-step explanation:

The population distribution is assumed to be normal. Which distribution to use?

If we have the standard deviation for the sample, we use the t-distribution.

If we use the standard deviation for the population, we use the z-distribution.

There is a known standard deviation of 2.2 minutes.

This means that 2.2 is the population standard deviation, and thus, the z-distribution should be used for this problem.

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2 years ago

HELP WITH QUESTION 14 AND 15 IF I GET THEM RIG U WILL GIVE BRAINLIEST

Mila [183]

Answer:

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Step-by-step explanation:

8 0

2 years ago

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What is r = wp, for p

weqwewe [10]

<span>What is r = wp, for p
</span>r = wp...divide both sides by w
so then p = r/w

3 0

2 years ago

Solve the congruence 9x 17 (mod 26).

vovikov84 [41]

We have $17\equiv-9\pmod{26}$ , so that $x\equiv-1\pmod{26}$ , so $x\equiv25\pmod{26}$ , and any solution of the form $x=25+26n$ satisfies the congruence, where $n$ is any integer.

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3 years ago

Tabitha earns $7 per hour working at the mail. Last week, she worked for 12 1/4 hours. Which best describes how much money she e

Tcecarenko [31]

Answer:

Step-by-step explanation:

7 * 12 = 84

And 1/4 hours which is 7/4 which is $1.25 more.

So she got 85.25 dollars in total, which is a little less than $90.

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2 years ago

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