2 years ago

I need help with this please

Mathematics

1 answer:

Gnoma [55]2 years ago

4 0

Answer:

He started with 180.

Step-by-step explanation:

If 90 is 50% of what he started with, then the other 50% is 90

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Two samples each of size 25 are taken from independent populations assumed to be normally distributed with equal variances. the

NeTakaya

$n_1=25, n_2=25\\ \bar{X_1}=35.5, \bar{X_2}=33\\ s_1=3, s_2=4$

Pooled Combined Variance $s_p=12.5$

Test Statistic:

$t=\frac{\left(\bar{X_1}-\bar{X_2}\right)}{s_p\sqrt{\frac{1}{n_1}+\frac{1}{n_2}}}$

$t=\frac{\left(35.5-33\right)}{12.5\sqrt{\frac{1}{25}+\frac{1}{25}}}$

$\left|t\right|=0.01414$

Degrees of freedom = $n_1+n_2-2=25+25-2=48$

$\alpha =0.05$

$t-Critical =t_{\alpha /2, n_1+n_2-2}=t_{0.025, 48}=-2.0206 \\Table value=|t|=2.0206\\|t|=2.0206$

The table value is greater than the calculated value.

Thus we accept H0.

8 0

3 years ago

six cocker spaniels have a total weight of 192 pounds. Five golden retreivers have a average weight of 71 pounds. what is the av

Pani-rosa [81]

Answer:

23.9lbs or 24lbs

Step-by-step explanation:

This may not be correct so don't bet your first born on it

4 0

2 years ago

Dina was running for two hours at a speed of 6 miles per hour. How far did she run?

lys-0071 [83]

Answer:

12 miles

Step-by-step explanation:

6 times 2 = 12

3 0

3 years ago

Read 2 more answers

QUICK HELP!!!!!!!!!!!!!!!!

JulijaS [17]

Answer:

Its C im pretty sure. Also loveee your pfp!

3 0

3 years ago

-2/3x + 2.8 = -8.2 what is x

JulsSmile [24]

-2/3x + 2.8 = -8.2 what is x
Add 2.8 on both side of the equation
-2/3x=-11
Divide both side by -2/3
x=33/2

Check: -2/3(33/2)+ 2.8 = -8.2
-11+2.8=-8.2
-8.2=-8.2

Answer is x=33/2

6 0

3 years ago