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yuradex [85]
3 years ago
8

The mean spent on lottery tickets is normally distributed with a mean of $6.50 and a standard deviation of $2.25. If one custome

r is randomly selected, find the probability they will spend between $4 and $9.50
Mathematics
1 answer:
Natasha_Volkova [10]3 years ago
7 0
First, we have to find the z scores of $4 and $9.50.
Z₁ = ($4 - $6.50)/$2.25 = -1.11
Z₂ = ($9.50 - $6.50)/$2.25 = 1.33

Then, using a z score table, we find the probability of 1.33 and -1.11, and subtract them to determine the probability in between.
0.9082 - 0.1335 = 0.7747 or 77.47%.
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Travka [436]

Step-by-step explanation:

-20+11

negative and positive sign will change in negative so ans will be=-9

because positive sign is on greater number

6 0
3 years ago
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Write an expression for the calculation add 34 and 6 and then multiply 3
Ymorist [56]

We need to write an expression for "add 34 and 6 and then multiply 3"

"Add" represents + operation .

"multiply" represents × operation.

We need to add 34 and 6.

So, we can write 34+6 and then we need multiply the sum by 3.

So, we need to keep above addition of 34 and 6 in parantehsis. We get

(34+6) × 3.

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3 years ago
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Answer:

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Step-by-step explanation:

Edgenuity 2020

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What is the sum? (1/x+2)+(1/x+3)+(1/X^2+5+6)
PolarNik [594]
For this case we have the following expression:
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7 0
3 years ago
An owner of a small store knows that in the last week 54 customers paid with cash, 42 paid with a debit card, and 153 paid with
goblinko [34]

Answer:

Step-by-step explanation:

54 customers paid with cash

42 paid with debit card

153 paid with credit card

Add them up to find the total amount of people:

54 + 42 + 153 = 249

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54/249

So the probability that customers will pay cash is 54/249 or 18/83

8 0
3 years ago
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