Will give what does it mean that nikoleta is in the 10th percentile for both length and weight? is that a desirable statistic if she was in the 50th percentile at birth

90% of people weigh more than Nikoleta and weigh 10%less

Not necessarily desirable - she was born at 50% percentile which means she is in the middle (or average) so average height and weight

10% percentile just means that she is the top 10% for height and weight, so she is tall, but weighs more.

However, the ratio of height to weight is the same, so she just grew more height and weight wise.

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