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Vikki [24]
3 years ago
9

Sally has $1.50 worth of change in her pocket-- all nickels and dimes. She has three times as many nickels as dimes. Find the nu

mber of each
Mathematics
1 answer:
GuDViN [60]3 years ago
6 0
If we use x for the number of dimes, and y for the number of nickels, then from this problem we know:
x(.10)+y(.05)=1.50
since each dime we have is another .10 dollars, and each nickel is another .05 dollars, as well as
3x=y
since we have 3 times as many nickels, we have to multiply dimes by 3 to have the same number of coins.

plugging this in to the first equation we get:
x(.10)+3x(.05)=1.50
.1x+.15x=1.5
.25x=1.5
x=6
Sally has 6 dimes.
Plugging this back in to 3x=y, we get
3(6)=y
18=y
So, Sally has 18 nickels
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The answer is below

Step-by-step explanation:

1)

mean (μ) = 12, SD(σ) = 2.3, sample size (n) = 65

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2)

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The z score of α/2 is the same as the z score of 0.44 (0.5 - 0.06) which is equal to 1.56

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