According to the world health organization (who) child growth standards, the head circumference for girls who are two-years old has a normal probability distribution witha mean of 47.2cm and a standard deviation of 1.4cm. what is the head circumference of a two-year old girl who marks the start of the 90th percentile? enter a number without units.

Hence, 49.0 cm is the head circumference of a two-year old girl who marks the start of the 90th percentile.    

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 47.2 cm

Standard Deviation, σ = 1.4 cm

We are given that the distribution of head circumference is a bell shaped distribution that is a normal distribution.

Formula:

We have to find the value of x such that the probability is 0.9

P(X < x)  

Calculation the value from standard normal z table, we have,  

Hence, 49.0 cm is the head circumference of a two-year old girl who marks the start of the 90th percentile.

total amount to be paid = $19.5

step-by-step explanation:

given ,

original price = $25.99

discount = 25%

discount amount = 25% of original price

discount amount = 25/100   * 25.99

discount amount = $6.49

hence , the total amount to be paid = original price - discount amount

                                                            = $25.99 - $6.49

                                                            =$19.5

total amount to be paid = $19.5

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step-by-step explanation:

its wrong