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2 years ago

9

Please help me with this !

1 answer:

SSSSS [86.1K]2 years ago

3 0

Answer:

mE=mC

mD=mB

Step-by-step explanation:

thats should be correct

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if $38 is invested at a simple interest rate of 2% per year, what would the total account balance be after forty years?

Debora [2.8K]

The answer is$30.40

I=P×R×T

I=38×.02×40

I=30.40

6 0

2 years ago

A new catalyst is being investigated for use in the production of a plastic chemical. Ten batches of the chemical are produced.

zzz [600]

Answer:

$CI=(66.54,78.46)$

Step-by-step explanation:

Given : A new catalyst is being investigated for use in the production of a plastic chemical. Ten batches of the chemical are produced. The mean yield of the 10 batches is 72.5% and the standard deviation is 5.8%. Assume the yields are independent and approximately normally distributed.

To find : A 99% confidence interval for the mean yield when the new catalyst is used ?

Solution :

Let X be the yield of the batches.

We have given, n=10 , $\bar{X}=72.5\%$ , s=5.8%

Since the size of the sample is small.

We will use the student's t statistic to construct a 995 confidence interval.

$\bar X\pm t_{n-1,\frac{\alpha}{2}}\frac{s}{\sqrt n}$

From the t-table with 9 degree of freedom for $\frac{\alpha}{2}=0.005$

$t_{n-1,\frac{\alpha}{2}}=t_{9,0.005}$

$t_{n-1,\frac{\alpha}{2}}=3.250$

The 99% confidence interval is given by,

$CI=72.5 \pm 3.25\frac{5.8}{\sqrt{10}}$

$CI=72.5 \pm 5.96$

$CI=(72.5+5.96),(72.5-5.96)$

$CI=(66.54,78.46)$

8 0

2 years ago

A cell phone bill provider offers a plan that costs $20 per month plus $0.10 per text message sent or received. A comparable pla

dybincka [34]

Answer:

100 texts

Step-by-step explanation:

20+.1x=30

30-20=10

10 dollar difference in base prices.

10/.1 (to find out how many texts)

100 texts

7 0

2 years ago

Water stations will be placed every 600 meters of a fifteen kilometer race how many water stations will be needed

zaharov [31]

15 km = 15,000 m
every 600 m, there is one water station (starting point at 600 m)
number of stations needed : 15000/600 = 25 water stations

3 0

3 years ago

If the radius of a circle is 4 1/4 feet, what is the diameter

iragen [17]

All i know is that if the radius of a circle is 4 feet, the the diameter is 8 feet. Sorry, I don't know the rest.

4 0

2 years ago