2/4-1/4

Monsar Rebullida
2022-10-04

2/4-1/4

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asked 2022-05-02

Consider a standard deck of 52 cards (13 cards each in 4 suits, clubs, spades, diamonds and hearts). What is the probability of picking out a jack of spades and then, without replacing the card to the deck, pick out a jack of diamonds?

asked 2022-05-30

for what value of k will the vector (1,-2,k) in R^3 be a linear combination of the vectors (2,-1,-5)

asked 2020-12-17

Montarello and Martins (2005) found that fifth grade students completed more mathematics problems correctly when simple problems were mixed in with their regular math assignments. To further explore this phenomenon, suppose that a researcher selects a standardized mathematics achievement test that produces a normal distribution of scores with a mean of $\mu =100\text{}and\text{}a\text{}standard\text{}deviation\text{}of\text{}\sigma =24$ . The researcher modifies the test by inserting a set of very easy problems among the standardized questions and gives the modified test to a sample of n = 36 students. If the average test score for the sample is M = 120, is this result sufficient to conclude that inserting the easy questions improves student performance? Use a one-tailed test with $\alpha =.05$ .

The null hypothesis in words is ?

The null hypothesis in words is ?

asked 2022-06-12

What is the first step in solving the quadratic equation *x*2 – 40 = 0?

taking the square root of both sides of the equation

adding 40 to both sides of the equation

squaring both sides of the equation

subtracting 40 from both sides of the equation

asked 2022-09-27

two equivalent ratios by scaling up for 5:8

asked 2022-05-31

Use the promlem below, there are 4 blue marbles 5 red marbles 1 green marbles 2 black marbles in a bag suppose you select one marble at random find each probability of

P( not green)

asked 2021-05-05

Find each unknown for problem. Check your work. 1000−n=2581000−n=258