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2 years ago

Who can help me with this question please

Mathematics

1 answer:

VikaD [51]2 years ago

6 0

The scientific notation of this number is 1.24 x 10 $^{2}$

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Two students are interested in whether or not there is variation in their test scores for math class. There are 15 total math te

professor190 [17]

Answer:

$H_0=\sigma_1 =\sigma_2$

$H_a=\sigma_1 >\sigma_2$

Step-by-step explanation:

From the question we are told that

Number of math tests n=15

standard deviation 1 $\sigma _1=38.2$

standard deviation 1 $\sigma _2=22.5$

Generally given the two tailed test the null hypothesis is given as

$H_0=\sigma_1 =\sigma_2$

Generally given the two tailed test the null hypothesis is given as

$H_a=\sigma_1 >\sigma_2$

4 0

2 years ago

In the casino game of roulette, a gambler can bet on which of 38 numbers the ball will land when the roulette wheel is spun. On

ollegr [7]

Answer:

Expected winnings for one spin = 0.1

Step-by-step explanation:

Expected Value = Sum of [(Probability of X)(Value of X)]

E(X) = Σ [P(X).X]

Two Events : X = +68 , P(X) = 1/38 and X = -2 , P(X) = 37/38

E(X) = [(68) (1/38)] + [(-2)(37/38)]

[(68)(0.03)] + [(-2)(0.97)]

= 2.04 - 1.94

= 0.1

4 0

3 years ago

What number divided by -7 is equal to -15

steposvetlana [31]

Answer:

$x = -105$

Step-by-step explanation:

What number divided by -7 is equal to -15

∨ ∨ ∨ ∨ ∨

x ÷ -7 = -15

Multiply -7 to both sides:

$\frac{x}{-7}=15$

$x = -105$

3 0

2 years ago

The Barnes family has a coupon for 10% off their dinner. If their bill comes to $82.50 and they wish to tip 15%, what will they

satela [25.4K]

Answer:

Total cost= $86.25

Step-by-step explanation:

Giving the following information:

Discount= 10%

Nill= $82.5

Tip= 15%

First, we need to calculate the discounted price:

Discount price= 82.5 / 1.1= $75

Now, the tip:

Tip= 75*0.15= $11.25

Finally, the total cost:

Total cost= 75 + 11.25

Total cost= $86.25

3 0

3 years ago

There were 7 inches of rain in 24 hours. What is the average amount of rain per hour

Mademuasel [1]

Answer:

7 /24 inch per hour

Step-by-step explanation:

To find the average amount of rain, take the total amount of rain and divide by the time

7 inches / 24 hours

7 /24 inch per hour

7 0

2 years ago