Please need help to solve this

Mathematics

1 answer:

VashaNatasha [74]3 years ago

7 0

9 - 7 3/8 = ? You could borrow: 8 + 1 - 7 3/8. Subtract 7 from 8 and get 1; subtract 3/8 from 1 and get 5/8. This leaves you with 1 5/8. Note how I have subtracted the integer 7 from the integer 9 and then the fraction 3/8 from the whole number 1.

Alternatively, you could write 9 as 72/8 and 7 3/8 as 59/8. Subtract 59/8 from 72/8 and get 13/8, which is equal to 1 5/8 (same answer as before).

Alternatively, you could write 9 as 9.000 and 7 3/8 as 7.375. Then
9.000-7.375 = 1.625 = 1 5/8 (same answer as before).

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It is possible to score higher than 1600 on the combined mathematics and reading portions of the SAT, but scores 1600 and above

Citrus2011 [14]

Answer:

The proportion of scores reported as 1600 is 0.0032

Step-by-step explanation:

Let X be the score for 1 random person in SAT combining maths and reading. X has distribution approximately N(μ = 1011,σ = 216).

In order to make computations, we standarize X to obtain a random variable W with distribution approximately N(0,1)

$W = \frac{X-\mu}{\sigma} = \frac{X-1011}{216} \simeq N(0,1)$

The values of the cummulative distribution function of the standard Normal random variable, lets denote it $\phi$ are tabulated, you can find those values in the attached file. Now, we are ready to compute the probability of X being bigger than 1600