Please help with the main question in the middle pleaseeee

Mathematics

2 answers:

valina [46]2 years ago

6 0

Answer:

my addvice to you is ask your parent or teatch im sure they could give you a clou!

Step-by-step explanation:

Roman55 [17]2 years ago

3 0

Answer:

3x^2 - 5x + 1 (Option A).

Step-by-step explanation:

The a b and c in the formula relate to the letters in ax^2 + bx + c.

Comparing the 2 formula on the first line of the question:-

We see that b = -5 , a = 3 and c = 1.

So its 3x^2 - 5x + 1 (Option A).

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2 years ago

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An aptitude test has a mean score of 80 and a standard deviation of 5. The population of scores is normally distributed. What pr

konstantin123 [22]

Answer:

2.28% of tests has scores over 90.

Step-by-step explanation:

Problems of normally distributed samples are solved using 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 problem, we have that:

$\mu = 80, \sigma = 5$