Assuming that the random variable X= spend on beauty products by women during summer months distributes normally , then using the standarized variable Z:

Z= (X - mean / st. dev) = (160.00-146 )/28 = 0.5

then using normal probability tables for Z:

P(X<160)=P(Z<0.5) = 0.691 (69.1%)

thus 69.1% of the woman spend less than $160

7 0

3 years ago

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Vikentia [17]

Answer:

Step-by-step explanation:

A)

A - the population after its decrease

x - the number of years in which there has been a decrease in population

Hence,

$\displaystyle\\A=30000-475x\\A+475x=30000-475x+475x\\A+475x=30000\\A+475x-A=30000-A\\475x=30000-A$

Divide both parts of the equation by 475:

$\displaystyle\\x=\frac{30000-A}{475}$

B)

$\displaystyle\\x=\frac{30000-24300}{475} \\\\x=\frac{5700}{475}\\\\x=\frac{12*475}{475} \\\\x=12\ years$

3 0

2 years ago