3 years ago

Mario tried to solve an equation step by step.

Mathematics

1 answer:

Zarrin [17]3 years ago

5 0

Answer:

Step 2

Step-by-step explanation:

Mario made a mistake in Step 2 when substracting $\frac{1}{3}$ from $\frac{4}{3}$ . When substracting his result ended up being $\frac{2}{3}$ but it is actually....

$\frac{4}{3} - \frac{1}{3} = \frac{4-1}{3} = \frac{3}{3} = 1$

so the right answer is $q = 1$

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A professor at a local university noted that the exam grades of her students were normally distributed with a mean of 73 and a s

Umnica [9.8K]

Answer:

88.51 is the minimum score needed to receive a grade of A.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 73

Standard Deviation, σ = 11

We are given that the distribution of exam grades is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

We have to find the value of x such that the probability is 0.0793.

$P( X \geq x) = P( z \geq \displaystyle\frac{x - 73}{11})=0.0793$

$= 1 -P( z \leq \displaystyle\frac{x - 73}{11})=0.0793$

$=P( z \leq \displaystyle\frac{x - 73}{11})=0.9207$

Calculation the value from standard normal z table, we have,

$P(z \leq 1.410) = 0.9207$

$\displaystyle\frac{x - 73}{11} = 1.410\\x =88.51$

Hence, 88.51 is the minimum score needed to receive a grade of A.

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3 years ago

Priyas family exchanged 250 dollars for 4,250 pesos. priya bought a sweater for 510 pesos how many dollars did the sweater cost

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Answer: 30

Step-by-step explanation:

4250/250= 17 ( 1 dollar = 17 pesos )

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