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Reptile [31]
3 years ago
5

Sum up 40 and 18,subtract therefrom 7.Then multiply with 8.

Mathematics
2 answers:
victus00 [196]3 years ago
8 0
40+18-7×8=58-56=2

or 

(40+18)-7×8=(58)-(56)=2

What exactly do you need help with?
Kryger [21]3 years ago
5 0
[(40+18)-7]\cdot8=(58-7)\cdot8=51\cdot8=408
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A random sample of 100 recorded deaths in the United States during the past year showed an average life span of 71.8 years. Assu
Oliga [24]

Answer:

This indicates that the chances of the mean life span today is greater than 70 years is 0.5871

Step-by-step explanation:

The past year showed an average life span of 71.8 years.

\mu = 71.8 years

Population standard deviation = 8.9 years

\sigma = 8.9 years

We are supposed to find the mean life span today is greater than 70 years

i.e. P(X>70)

Formula : Z = \frac{x-\mu}{\sigma}

Z=\frac{70-71.8}{8.9}

Z=−0.202

P(X<70)=0.4129

P(X>70)=1-P(X<70)=1-0.4129=0.5871

Hence This indicates that the chances of the mean life span today is greater than 70 years is 0.5871

7 0
4 years ago
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stephen invests £7500 in an account which pays 5.5% compound interest per annum. Stephen has to pay 20% tax on the interest each
garri49 [273]
Interest earned
7,500×0.055
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Deduct tax
412.5−412.5×0.2
=330
Add the remaining interest
330+7,500
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Calculate interest earned in the second year
7,830×0.055
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Deduct tax
430.65−430.65×0.2
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5 0
4 years ago
Which of the following is a rational number?<br> 148, 49, 50, 51
Katarina [22]

Answer:

50 is the answer because you can divide 2 numbers to get this number.

4 0
3 years ago
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Find the common difference and the next three terms of the arithmetic sequence. 1/4,1/2,3/4,1,5/4
andriy [413]

Hi there! :)

Answer:

\large\boxed {\frac{1}{4}} Common difference

\large\boxed{\frac{3}{2}, \frac{7}{4}, 2} Next three terms

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Find the common difference by subtracting the previous term from a term. We can use the terms 1/4 and 1/2:

Convert 1/2 into a fraction over 4:

1/2 · 2/2 = 2/4

Find the common difference by subtracting the fractions:

2/4 - 1/4 = 1/4. This is the common difference.

Find the next 3 terms by adding 1/4:

5/4 + 1/4 = 6/4 (Reduce fraction) = 3/2

6/4 + 1/4 = 7/4

7/4 + 1/4 = 8/4 (Reduce fraction)

Therefore, the next 3 terms are 3/2, 7/4 and 2.

3 0
3 years ago
If you wanted to make a game where you pay $5 if you can't guess a random dogs weight within 16lbs what payout should you offer
ella [17]

Answer:

Following are the solution to the given question:

Step-by-step explanation:

The population std. dev of the dog weight=8

\sigma=8\\\\P(\text{guess with in 16 lbs}) = P(|X-\mu|\leq 16)\\\\=P(-2 \leq Z \leq 2) = 0.9544\\\\

Calculating the payout w s.t:

E[netpay]=0=(-5) \times 0.9544+w\times (1-0.9544)\\\\ w =(5 \times \frac{0.9544}{1-0.9544}) =\$ 104.65

therefore, we assume that the weight of the dog is a normal distribution with std. deviation that is 8.

4 0
3 years ago
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