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3 years ago

Mario was given some birthday

Mathematics

1 answer:

Len [333]3 years ago

4 0

The answer would be option B "he was given $50 for his birthday."

Here is how:

Y equals the amount of money in the account.

75$+50$=

75x represents the amount of money he DEPOSITS which is in the question.

So if he deposits 75$ a week (which represents X) and he adds 50$ to it which means he has 50$ to begin with which means he got 50$ for his birthday.

Also....

Because 75x already represents X therefore it wouldn't be options A, C or D.

Hope this helps!

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A school is arranging a field trip to the zoo. The school spends 615.65 dollars on passes for 33 students and 2 teachers. The sc

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the answer is $26.38

Step-by-step explanation:

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3 years ago

A farmer raises cows and chickens. The farmer has a total of 25 animals. One day he counts the legs of all of his animals and co

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A math teacher gave her students two tests. On the first test, 80% of the class passed the test, but only 30% of the class passe

zimovet [89]

Answer:

0.375 is answer

Step-by-step explanation:

Given that the math teacher gave her students two tests. On the first test, 80% of the class passed the test. But only 30% of the class passed both tests.

Let A - the students pass I test

B = students pass second test

Then P(A) = 80%=0.8 and P(AB) = 30% =0.30

Required probability =probability that a student passes the second test, given that they passed the first one

= P(B/A) = P(AB)/P(A)

= 0.30/0.80

=3/8

=0.375

Right answer is 0.375

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3 years ago

The National Vital Statistics Reports for November 2011 states that U.S. preterm birth rate for 2010 was about 12%. Preterm birt

miskamm [114]

Answer:

$0.104 - 1.96\sqrt{\frac{0.104(1-0.104)}{500}}=0.0772$

$0.104 + 1.96\sqrt{\frac{0.104(1-0.104)}{500}}=0.1308$

The 95% confidence interval would be given by (0.0772;0.1308)

Step-by-step explanation:

For this case we can calculate the estimated proportion like this:

$\hat p =\frac{52}{500}= 0.104$

We can assume that the normal model can be used since we satisfy two conditions:

$np =500*0.104= 52>10$

$n(1-p) = 500*(1-0.104) = 448>10$

The confidence level for this case is 95% of confidence, and the significance is given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by: