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Harrizon [31]
3 years ago
9

What percent of 250 is 50 20% 25%50%15%

Mathematics
1 answer:
enyata [817]3 years ago
5 0

It’s 20 % hope that helps!


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4.42 × 10–10 4.2 × 1010
Mama L [17]

Answer:

-105197.8

Step-by-step explanation:

4.42 × 10-104.2 × 1010 = -105197.8

Hope this helps!

5 0
2 years ago
How much is 7 inches subtracted by 2/8
lbvjy [14]
That would be 6 and 6/8 inches
4 0
3 years ago
What is another way to write 0.7?
SVEN [57.7K]
7/10. Because 0.7 equals 70% . As a fraction it would be 70/100. Simplify, and you get 7/10. 
8 0
3 years ago
• A researcher claims that less than 40% of U.S. cell phone owners use their phone for most of their online browsing. In a rando
antiseptic1488 [7]

Answer:

We failed to reject H₀

Z > -1.645

-1.84 > -1.645

We failed to reject H₀

p > α

0.03 > 0.01

We do not have significant evidence at a 1% significance level to claim that less than 40% of U.S. cell phone owners use their phones for most of their online browsing.

Step-by-step explanation:

Set up hypotheses:

Null hypotheses = H₀: p = 0.40

Alternate hypotheses = H₁: p < 0.40

Determine the level of significance and Z-score:

Given level of significance = 1% = 0.01

Since it is a lower tailed test,

Z-score = -2.33 (lower tailed)

Determine type of test:

Since the alternate hypothesis states that less than 40% of U.S. cell phone owners use their phone for most of their online browsing, therefore we will use a lower tailed test.

Select the test statistic:  

Since the sample size is quite large (n > 30) therefore, we will use Z-distribution.

Set up decision rule:

Since it is a lower tailed test, using a Z statistic at a significance level of 1%

We Reject H₀ if Z < -1.645

We Reject H₀ if p ≤ α

Compute the test statistic:

$ Z =  \frac{\hat{p} - p}{ \sqrt{\frac{p(1-p)}{n} }}  $

$ Z =  \frac{0.31 - 0.40}{ \sqrt{\frac{0.40(1-0.40)}{100} }}  $

$ Z =  \frac{- 0.09}{ 0.048989 }  $

Z = - 1.84

From the z-table, the p-value corresponding to the test statistic -1.84 is

p = 0.03288

Conclusion:

We failed to reject H₀

Z > -1.645

-1.84 > -1.645

We failed to reject H₀

p >  α

0.03 > 0.01

We do not have significant evidence at a 1% significance level to claim that less than 40% of U.S. cell phone owners use their phones for most of their online browsing.

8 0
3 years ago
The length of Suez Canal on a map of drawing scale 1 : 1400000 is 70 Km ,then its
lapo4ka [179]

Answer:

76

Step-by-step explanation:because its the answer

7 0
2 years ago
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