What is the value of x?

Mathematics

2 answers:

Vikentia [17]2 years ago

8 0

Answer: Option 'A' is correct.

Step-by-step explanation:

Since we have given that

$x+\dfrac{4}{9}=\dfrac{3}{4}$

We need to find the value of 'x'.

$x+\dfrac{4}{9}=\dfrac{3}{4}\\\\x=\dfrac{3}{4}-\dfrac{4}{9}\\\\x=\dfrac{27-16}{36}\\\\x=\dfrac{11}{36}$

Therefore, the value of x = $\dfrac{11}{36}$

Hence, Option 'A' is correct.

Vikki [24]2 years ago

3 0

The answer is A.
hope this helps!

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If students’ scores were normally distributed and the mean was 200 with a standard deviation of 40, then what is the probability

Sonja [21]

Answer:

84%

Step-by-step explanation:

The empirical rule tells you that 68% of the standard normal distribution is within 1 standard deviation of the mean. The distribution is symmetrical, so the amount in the lower tail is (1 -68%)/2 = 16%.

Since the number you're interested in, 240, is one standard deviation above the mean (200 +40), the percentage of interest is the sum of the area of the central part of the distribution along with the lower tail:

68% + 16% = 84%.