can you pleeeasse break that Johnny question down step by step I have to show the work thanks I'll give u the brainliest?

Mathematics

1 answer:

Leno4ka [110]3 years ago

6 0

Answer:

Johnny and his family left home at 10:00.

Step-by-step explanation:

First, You add all of the minutes up,

45+20+10= 75

Then convert the minutes to hours,

75 mins = 1 hr and 15 mins.

Add the hours together,

1 hr + 2 hrs = 3 hrs

Then add minutes,

3 hrs and 15 minutes

Subtract 3 hrs and 15 mins from 13:15,

13.15 - 3.15 = 10:00

Your answer is:

Johnny and his family left home at 10:00.

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A local company makes a candy that is supposed to weigh 1.00 ounces. A random sample of 25 pieces of candy produces a mean of 0.

AysviL [449]

Answer:

$n=(\frac{2.58(0.004)}{0.001})^2 =106.50 \approx 107$

So the answer for this case would be n=107 rounded up to the nearest integer

Step-by-step explanation:

Information given

$\bar X= 0.996$ the sample mean

$s=0.004$ the sample deviation

$n =25$ the sample size

Solution to the problem

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (a)

And on this case we have that ME =0.001 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

We can use as estimator of the real population deviation the sample deviation for this case $\hat \sigma = s$ / The critical value for 99% of confidence interval is given by $z_{\alpha/2}=2.58$ , replacing into formula (b) we got: