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4 years ago

How many square feet of outdoor carpet will we need for this hole?

Mathematics

2 answers:

Llana [10]4 years ago

8 0

30 ft

Area= base*height ad you want the sum of the areas of each rectangle.

The top one had an are of 8 [4*2]
The middle one had an area of 12 [6*2]
The bottom one had an area of 10 [5*2]

8+12+10=30!

boyakko [2]4 years ago

6 0

First, break up the entire thing into smaller rectangles then find the area of all of those rectangles and add them together to get 30 square feet.

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The null hypothesis is $H_o : \sigma^2_1 = \sigma^2 _2$

The alternative hypothesis is $H_a : \sigma_1 ^2 > \sigma^2_2$

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Step-by-step explanation:

From the question we are told that

The first sample size is $n_1 = 30$

The sample variance for elementary school is $s^2_1 = 8324$

The second sample size is $n_2 = 30$

The sample variance for the secondary school is $s^2_2 = 2862$

The significance level is $\alpha = 0.05$

The null hypothesis is $H_o : \sigma^2_1 = \sigma^2 _2$

The alternative hypothesis is $H_a : \sigma_1 ^2 > \sigma^2_2$

Generally from the F statistics table the critical value of $\alpha = 0.05$ at first and second degree of freedom $df_1 = n_1 - 1 = 30 - 1 = 29$ and $df_2 = n_2 - 1 = 30 - 1 = 29$ is