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vladimir1956 [14]
2 years ago
10

I REALLY NEED THIS ANSWER ASAP !!!

Mathematics
2 answers:
ANEK [815]2 years ago
8 0

Answer:

hope this helps..........

Ganezh [65]2 years ago
7 0
The answer should be c. I hope it helps :)
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There were 45 pies sold in all.

Step-by-step explanation:

10 + 15 = 25

25 + 20 = 45

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Explain how to draw a line segment that measures 72 millimeters.
oee [108]

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get a ruler and meshure out 72 millimeters.

Step-by-step explanation:

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kumpel [21]
8.
40+105+x=180\\
x=35

9.
The sum of two sides must be greater than the third side.
It can't be 5 because 5+5=10\not>12.
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3 years ago
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otez555 [7]
I think it’s the first one
5 0
3 years ago
A random sample of 64 second-graders in a certain school district are given a standardized mathematics skills test. The sample m
svet-max [94.6K]

Answer:

Given : The sample mean score is 51.48 .

            The standard deviation for the population of test scores is 15.

             The nationwide average score on this test is 50.

To Find :  Perform the hypothesis test and compute the P-value?

Solution:

Sample size = n = 64

Since n > 30

So, we will use z test over here

We are supposed to find The school superintendent wants to know whether the second-graders in her school district have greater math skills than the nationwide average.

Hypothesis : H_0:\mu \leq 50\\H_a:\mu>50

Formula of z test : z =\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}

x = 51.48\\\mu = 50\\\sigma = 15\\ n = 64

Substitute the values

z =\frac{51.48-50}{\frac{15}{\sqrt{64}}}

z =0.789

Find the value of P(z) from z table

p(z)=0.7823

Since we are given that we are supposed to find The school superintendent wants to know whether the second-graders in her school district have greater math skills than the nationwide average.

So, p value = 1-P(z)  = 1-0.7823=0.2177

In general , Level of significance is 0.05

So, p value is greater than alpha.

So, we accept the null hypothesis.

5 0
3 years ago
Read 2 more answers
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