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sertanlavr [38]
3 years ago
15

The temperature this morning was -4 degrees. During the day, it dropped another 7 degrees. What was the temperature after it dro

pped?
Mathematics
2 answers:
PSYCHO15rus [73]3 years ago
7 0

Answer:

The temp would be -11



Vika [28.1K]3 years ago
3 0
-4 - (+7)


The answer is -11
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Andi purchased 1/3 pound of cashews for $2.85.What is the cost of 1 pound of cashews.
Minchanka [31]
1/3 lb. = $2.85
1/3 lb = $2.85
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6 0
3 years ago
1. The national mean (μ) IQ score from an IQ test is 100 with a standard deviation (s) of 15. The dean of a college wants to kno
Nat2105 [25]

Answer:

We conclude that the mean IQ of her students is different from the national average.

Step-by-step explanation:

We are given that the national mean (μ) IQ score from an IQ test is 100 with a standard deviation (s) of 15.

The dean of a college want to test whether the mean IQ of her students is different from the national average. For this, she administers IQ tests to her 144 students and calculates a mean score of 113

Let, Null Hypothesis, H_0 : \mu = 100 {means that the mean IQ of her students is same as of national average}

Alternate Hypothesis, H_1 : \mu\neq 100  {means that the mean IQ of her students is different from the national average}

(a) The test statistics that will be used here is One sample z-test statistics;

               T.S. = \frac{Xbar-\mu}{\frac{s}{\sqrt{n} } } ~ N(0,1)

where, Xbar = sample mean score = 113

              s = population standard deviation = 15

             n = sample of students = 144

So, test statistics = \frac{113-100}{\frac{15}{\sqrt{144} } }

                             = 10.4

Now, at 0.05 significance level, the z table gives critical value of 1.96. Since our test statistics is more than the critical value of z which means our test statistics will fall in the rejection region and we have sufficient evidence to reject our null hypothesis.

Therefore, we conclude that the mean IQ of her students is different from the national average.

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What’s the full question? you only put part of it on here
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Which number is greater: 1/4 or 5/4 ?
tatiyna

Answer:

1/4 < 5/4

Step-by-step explanation:

Since the numbers have the same denominator, we compare the numerators

1<5

so 1/4 < 5/4

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2 years ago
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Find the surface area of the prism.
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Answer:

I cant see it ill go on your page when you post it with the picture.

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