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lara [203]
3 years ago
7

The Girl Scouts are selling cookies. They have made $437 so far. They need to sell more than $1000 to go on a scout retreat. Wha

t are the different amounts of money they still could raise in order to go on the retreat? Group of answer choices They still need to make $563 or less They still need to make $563 or more They still need to make more than $563 They still need to make less than $563
Mathematics
1 answer:
beks73 [17]3 years ago
6 0

Answer:they still need to make 563 or more. They still need to make more than 563

Step-by-step explanation:

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if £2000 is placed into a bank account that pay 3% compound interest per year how much will be in the account after 2 year
zalisa [80]
Use the compound amount formula:

A = P(1+r)^t

Here, A = £2000 (1+0.03)^2 = <span>£2121.80 (answer)</span>
6 0
3 years ago
What is 5(n-1)=2(n-4)-6
Shalnov [3]

Answer:

Step-by-step explanation

6n - 6 = 2 (n+1)

Simplify 2 (n+1)

6n - 6= 2n +2

Move all terms related to n to the left side of the equation

4n -6 =2

Move all terms not related to n to the right side of the equation

4n =8

Divide each term by 4 then simplify

n=2  

5 0
3 years ago
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suppose X and Y are independent random variables, both with normal distributions. If X has a mean of 45 with a standard deviatio
djyliett [7]

Answer:

0.9772 = 97.72% probability that a randomly generated value of X is greater than a randomly generated value of Y

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question:

\mu_X = 45, \sigma_X = 4, \mu_Y = 35, \sigma_Y = 3

What is the probability that a randomly generated value of X is greater than a randomly generated value of Y

This means that the subtraction of X by Y has to be positive.

When we subtract two normal variables, the mean is the subtraction of their means, and the standard deviation is the square root of the sum of their variances. So

\mu = \mu_X - \mu_Y = 45 - 35 = 0

\sigma = \sqrt{\sigma_X^2+\sigma_Y^2} = \sqrt{25} = 5

We want to find P(X > 0), that is, 1 subtracted by the pvalue of Z when X = 0. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{0 - 10}{5}

Z = -2

Z = -2 has a pvalue of 0.0228

1 - 0.0228 = 0.9772

0.9772 = 97.72% probability that a randomly generated value of X is greater than a randomly generated value of Y

4 0
3 years ago
PLS HELP ME ASAP FOR 7 and 8!! (MUST SHOW WORK!!) + GIVING BRAINLIEST AND THANKS
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Question 7:

Diameter = 6.2 cm so Radius = 3.1 cm
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If an average walk to the gas station is 15 minutes. why has my dad been gone for 11 years?
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i-

Step-by-step explanation:

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